Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd1cb75258aa2e90…

MALICIOUS

PDF

79.0 KB Created: 2021-04-22 15:20:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 6187f2f6aff811b8236d853e4a41be21 SHA-1: 2e1f3ac0c65f66ab1590299ea12f504534e7353d SHA-256: cd1cb75258aa2e90361241a115bc5313bed9f2b636923e5ef7f6ac47b3de6657
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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=life+application+study+bible+large+print PDF link annotation
    • http://uaregroup.com/558385956997lz81.pdfIn PDF document text
    • https://cdn.sqhk.co/suxujaba/gsX2ZpZ/59613976271.pdfIn PDF document text
    • http://rasprodavaika.ru/loxepe2h0ee.pdfIn PDF document text
    • http://universityru.fun/fanefekepejirawagojugew1j7j.pdfIn PDF document text
    • https://cdn.sqhk.co/rapawaferew/njikffF/huuuge_casino_slots_best_slot_machines.pdfIn PDF document text
    • https://cdn.sqhk.co/datawafag/1ggJjgc/razisivelapejepivukejutub.pdfIn PDF document text
    • https://cdn.sqhk.co/rasepotobami/hkgeggQ/82744149761.pdfIn PDF document text
    • https://cdn.sqhk.co/badalozebale/vNgcIib/19680759329.pdfIn PDF document text
    • http://tokio-2020.fun/wosomop93f81.pdfIn PDF document text
    • http://golomashvanna.xyz/minecraft_pe_bedwars_onlineefsgi.pdfIn PDF document text
    • https://cdn.sqhk.co/beratinuga/jd0iccW/14980880499.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://ca483b97-61ac-4196-bca0-6b249c18eca9.filesusr.com/ugd/b27199_321492bcc0c24b89824ba2b75008b48d.pdf?index=trueIn PDF document text
    • https://1864c106-1a4f-4194-99fb-dabd5a0af450.filesusr.com/ugd/17b194_324f4461ea4c44eebd28d8efa55d26df.pdf?index=trueIn PDF document text
    • https://db532842-334f-4efb-8993-e67ec8f20ff5.filesusr.com/ugd/bc5be3_4379aba57f3e44dcb0c41592c33dc4de.pdf?index=trueIn PDF document text
    • https://f904ef53-caa1-4f0f-8a97-c50675c03ece.filesusr.com/ugd/2f8cea_fcd41798da904d1389ac9d3a0d4c7ff6.pdf?index=trueIn PDF document text
    • https://a3cd4400-5fdc-4e6a-bda8-88556a2d4d1f.filesusr.com/ugd/2f7489_fdf1e199d1d549b6b866b0edcc71f4dc.pdf?index=trueIn PDF document text
    • https://f3b8d348-8566-49c9-a9f8-a2c3b9e1bc8e.filesusr.com/ugd/f1c748_a7c0933a9ba54af38510040e42b1bd78.pdf?index=trueIn PDF document text
    • https://2efabd41-1f95-43d0-8245-5f8eb9267247.filesusr.com/ugd/2f4ddf_64f51691bd3d4c0daebe4e38c4f42ef3.pdf?index=trueIn PDF document text
    • https://b0c090b1-cb02-46d8-8a69-3fb9d82636b6.filesusr.com/ugd/4dbf3f_4de39afc746444f4a6d5a35e034c08bd.pdf?index=trueIn PDF document text
    • https://b3709dad-42f4-4621-9b7e-74d31ca978cd.filesusr.com/ugd/f91cf1_4b28b9591e1640f2a2722fe4c2328ce3.pdf?index=trueIn PDF document text
    • https://9e77dbea-16d6-438e-9859-4a68c5388828.filesusr.com/ugd/3225da_bd79a596879c411faff0159b1a0696e5.pdf?index=trueIn PDF document text
    • https://7be326e9-a1fd-4761-a84c-83c904220737.filesusr.com/ugd/37e945_d38e895641ed41dca0976a232052de2b.pdf?index=trueIn PDF document text
    • https://3c1efe6f-6e34-41bb-a2c4-2be85dd3cb33.filesusr.com/ugd/41f880_d8315817f97d4350b0d7052b31cb1151.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7FB 5388 bytes
SHA-256: 7683d2f18edbfdb4a63ed8ba98815c547ff65545baa7e29b6cdcb910cfced9a2
font_01_sfnt_off0000fa5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA5B 11144 bytes
SHA-256: a683a199404e8f746a6c2638393649a71a1d10dd7b2dd410b661e34f0da1d52c
font_02_sfnt_off00012021.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12021 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378