Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8c1a41c91c3b421…

MALICIOUS

PDF

108.2 KB Created: 2021-04-23 05:09:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: b503fb854c34fa1424bf9408838764d4 SHA-1: 2675fa14d7b249a8aba110175b3a7383052df3bc SHA-256: f8c1a41c91c3b421358830b573688266b24c5a997bc8702da7d2a66eb0063f72
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm for SEO manipulation or phishing. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://vilenefex.ru/strik?utm_term=pmbok+6th+edition+process+flow+chart PDF link annotation
    • https://cdn.sqhk.co/dedizozife/2q55gik/scruffy_dog_cartoon.pdfIn PDF document text
    • https://cdn.sqhk.co/pubabolab/wuiehix/persian_calendar_year_now.pdfIn PDF document text
    • https://xeludopoveju.weebly.com/uploads/1/3/4/5/134528604/850256349397d85.pdfIn PDF document text
    • https://cdn.sqhk.co/wepigosogo/iKdDijB/rider_university_jobs.pdfIn PDF document text
    • https://toruruxixe.weebly.com/uploads/1/3/4/6/134698343/c67d79de27.pdfIn PDF document text
    • https://cdn.sqhk.co/sifolilo/dIgczOt/gevorijofirarun.pdfIn PDF document text
    • http://natbeach.space/what_education_is_needed_to_become_an_interior_designer_in_canada4bl47.pdfIn PDF document text
    • https://jinozeposejide.weebly.com/uploads/1/3/1/4/131453810/4308842.pdfIn PDF document text
    • https://bawilawuvibowe.weebly.com/uploads/1/3/4/4/134401702/bilofugivugowo-fakasedax-mudozijeweda.pdfIn PDF document text
    • https://bivejeweki.weebly.com/uploads/1/3/4/3/134322338/6e6f8b5ad.pdfIn PDF document text
    • http://pipvip.ru/gegonesugefadagac9kgt.pdfIn PDF document text
    • http://mybatut.store/3132347078ky8v5.pdfIn PDF document text
    • https://cdn.sqhk.co/pisomuwesuk/QggIBhc/final_countdown_keyboard_sheet_music.pdfIn PDF document text
    • http://mif-smeh.space/42052087190x9wn7.pdfIn PDF document text
    • http://fruittea.space/unicorn_free_icon_packehxin.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/362a2eda-69c9-4c8c-82d2-9d6ca25fced8/reinforced_concrete_design_to_eurocode_2_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/xunilukegez/61200206607.pdfIn PDF document text
    • https://c5c1e25b-3ca9-4f8f-aecb-0ee3b29cb37b.filesusr.com/ugd/f4fe7b_58e08af5ecc645aa8946f86850b7b5a2.pdf?index=trueIn PDF document text
    • https://e82ff0bd-cb1a-4782-8b92-0a0fb7657660.filesusr.com/ugd/d17951_9eb156561667471a8e376381cdee6954.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a6a18ee-34ac-41cb-b754-bc6475d94f58/libro_el_secreto_de_la_ley_de_atraccion_resumen.pdfIn PDF document text
    • https://s3.amazonaws.com/xisefowu/pilates_reformer_classes_in_my_area.pdfIn PDF document text
    • https://c145ee04-3c3b-4786-8b94-e0511401b322.filesusr.com/ugd/de65f7_dedc0f8dda9b41b89d18a2638e55fd72.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/36a51649-c5b1-47c8-8c09-78b3c8a01a11/rujuxovivojidug.pdfIn PDF document text
    • https://dfde94ff-8c6c-411d-9c04-f18b57906ec7.filesusr.com/ugd/47ec90_79eeb806ffdf4c688905ded41f9b0375.pdf?index=trueIn PDF document text
    • https://7ef5d8b8-74ac-4e0a-b0a0-fa61ca6462a8.filesusr.com/ugd/23e9be_2f50e5c4654c4702809f3d1d66091762.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off00017787.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x17787 22940 bytes
SHA-256: e26ecb5a93f6eeb6d38a276771a9f6cb1e494856975ccd70199a52dbf85b78ea
font_00_sfnt_off0000fe7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE7F 18736 bytes
SHA-256: 22c907f75b90de8b338ce0c6e40e03a0769435388ce5cbea58abcefe76f59896
font_01_sfnt_off00013ab5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AB5 5848 bytes
SHA-256: c3e0356d6aa087f06351208f2fa1a44e583921363c00736fb4ef272cd048be64
font_02_sfnt_off00014e7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E7F 12896 bytes
SHA-256: ba296ac90ba930e650c6568bc8af01d5d4c4ef158891736ebe08aa28a12fb233

Open this report in the interactive analyzer, or submit your own file for analysis.