Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c7a4b3bbdabd975…

MALICIOUS

PDF

77.8 KB Created: 2021-03-22 16:35:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: 3bede004ad86fc3aabfb5ed61d21634d SHA-1: fd97574d50e1301f619e5a5844e0088428c09ee7 SHA-256: 0c7a4b3bbdabd975ac1111c7d7a356d0ca836e24b2cca060d3694d5b10a168ca
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the extensive use of external URLs points to a T1566.001 (Spearphishing Attachment) initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • 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://jumiwimov.ru/123?utm_term=elf+movie+trivia+questions+and+answers+printable PDF link annotation
    • https://timurikamaz.weebly.com/uploads/1/3/1/4/131406182/diwerevav.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480588/normal_5ffa3cf9e15f1.pdfIn PDF document text
    • http://narosisebono.22web.org/judopeselasamopake.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412377/normal_603a18a5a4231.pdfIn PDF document text
    • http://buzatukati.iblogger.org/ragaxifavagusoxija.pdfIn PDF document text
    • https://wuwikofoxanep.weebly.com/uploads/1/3/1/4/131437976/pifovikekamonap_dumawita.pdfIn PDF document text
    • https://xopoloxunevagig.weebly.com/uploads/1/3/1/4/131406528/monefolosazigik.pdfIn PDF document text
    • https://fatuzolawodazu.weebly.com/uploads/1/3/4/7/134730183/7634979.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425915/normal_601fd1578097d.pdfIn PDF document text
    • http://lufawobakisi.22web.org/20809219215.pdfIn PDF document text
    • https://ragojozuzaz.weebly.com/uploads/1/3/4/6/134668900/4b1f986a9a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ca108e69-7b6b-43f0-8f16-d96ebeb8a33d.filesusr.com/ugd/79e0dc_dd1704e4fea9459bb6f1a59f16ac0e1b.pdf?index=trueIn PDF document text
    • http://sifuzetijo.rf.gd/bilimokupiwabezetudu.pdfIn PDF document text
    • http://vowaderisosalel.epizy.com/when_to_do_accessory_exercises.pdfIn PDF document text
    • https://667b589a-70dd-4c78-a03f-47f6e9f07b1f.filesusr.com/ugd/db80c5_507800770dce421ab2f5feedf795dc64.pdf?index=trueIn PDF document text
    • https://e0f910ba-f4aa-4d6b-87f6-24d78cda99ab.filesusr.com/ugd/cc15ef_92b02d2aff5143d7b6672d992bf06a55.pdf?index=trueIn PDF document text
    • http://merizipu.rf.gd/10800274640.pdfIn PDF document text
    • http://girodoge.epizy.com/prepu_for_acsms_resources_for_the_personal_trainer_fifth_edition.pdfIn PDF document text
    • http://xagevudogitoti.epizy.com/completing_the_square_worksheet.pdfIn PDF document text
    • http://tagexopesuzer.epizy.com/the_uses_of_enchantment_audiobook.pdfIn PDF document text
    • http://ridurosumebo.epizy.com/22011983645.pdfIn PDF document text
    • https://932aa67c-856a-4fda-9fc8-fe3f50d4acc2.filesusr.com/ugd/a25eee_7b491eb2870946d685b2323ad6e51746.pdf?index=trueIn PDF document text
    • http://kafokenenore.rf.gd/caesar_cipher_encryption.pdfIn 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_off0000f153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF153 5564 bytes
SHA-256: b96d005427a089bac3ae40c9b3b89ed382c0fe564da1ba14cfe917d0e7ead066
font_01_sfnt_off00010436.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10436 10852 bytes
SHA-256: 81b17666a1b95aaef242682cf7611a9155a55000e58f7406e27b3e6d093672b8