Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c965c842b525734…

MALICIOUS

PDF

79.2 KB Created: 2021-03-09 23:26:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 7ebdc6f7b4a05f5ae8aee20d018cf0be SHA-1: e6410dd0404d61c60f07592e3f7ba1d9c6506987 SHA-256: 9c965c842b52573488433024222c4311eefc8efa7229f250cc2e91f360247b95
244 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a link farm, containing a large number of external links, many hosted on disposable domains. One critical heuristic indicates a link to known malicious redirector infrastructure. While no scripts were extracted, the sheer volume of links and the presence of a malicious redirector suggest an attempt to lure users to potentially harmful content, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/award?keyword=equality+and+equity+pdf In PDF document text
    • http://domen3.club/how_to_do_predictive_analysis_in_rfejqa.pdfIn PDF document text
    • http://firstdoctor.xyz/what_is_guerilla_warfare_meaning_in_hindiu95q2.pdfIn PDF document text
    • http://knitfqph.site/etude_house_face_mask_price_philippinesob3g2.pdfIn PDF document text
    • http://yazansoft.com/nexo_causal_derecho_penalvkzi8.pdfIn PDF document text
    • http://mebets.xyz/what_is_the_spiritual_meaning_of_numbers_in_the_bible2dp52.pdfIn PDF document text
    • http://lidlid.xyz/american_academy_of_endocrinology_diabetes_guidelinesre0v5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://turizavoge.epizy.com/kivemejagujafinab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54e4f4b8-3883-48ba-b8a7-14cb5c4129bc/dyson_animal_cordless_vacuum_deals.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1dc10232-8273-461e-8246-73d96ecfa820/klein_collins_tiger_belles_instagram.pdfIn PDF document text
    • https://3437305d-a3f4-4f94-9a63-846dd410f5be.filesusr.com/ugd/ffe76b_7ef9c04f420d41f29c9e89513ae52533.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0351d586-8a97-4a1f-8b8a-31054031d91c/viking_sewing_embroidery_machine_reviews.pdfIn PDF document text
    • https://01dc7cc6-b8ed-446e-8cc8-1ad78882ed38.filesusr.com/ugd/e23fbb_24b8ced20bd340c2856bc3d88668e1d7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/41daec06-b707-4d24-ad6f-d2f56b51ce81/my_wireless_keyboard_is_not_working_dell.pdfIn PDF document text
    • http://magekuj.rf.gd/60262670106.pdfIn PDF document text
    • http://gadivedu.rf.gd/36673330275.pdfIn PDF document text
    • https://ec8c99fd-5413-4e38-b6a0-2ccbba71fc6f.filesusr.com/ugd/de02f3_ea5ffbc9f7134b6cb9399a68a9358532.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5d869b5-bb44-47d2-b485-ee41d079fc21/the_kid_who_ran_for_president_2.pdfIn PDF document text
    • http://vovajixavago.epizy.com/buffalo_pictures_free.pdfIn PDF document text
    • http://popirarubinuluk.rf.gd/play_store_game_now.pdfIn PDF document text
    • https://4c6480a9-ccec-4c20-853c-cc48681c44ad.filesusr.com/ugd/935adc_67fd394347a74f7f810884936e51b03f.pdf?index=trueIn PDF document text
    • https://6f8cb219-4830-455d-9ced-b55e65700e85.filesusr.com/ugd/fd30ac_eed7b321dd204aa581558376774a85e1.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA64 4944 bytes
SHA-256: f797df299f2b65d59afbe6544c00fdfe32e00ccee8345bcd9f3c49c25e7ea885
font_01_sfnt_off00010b5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B5C 10624 bytes
SHA-256: de4e13f2cc66787c1efbb54021eb81f2326b136b15e9ae33447cae159481b349

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