Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ab13b5e8021712c…

MALICIOUS

PDF

77.4 KB Created: 2021-03-21 00:37:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 9b2cbbdf15d9925667bfe8abb2811bb3 SHA-1: 50b99110fdbe385bed6965204594d371ad6fb77b SHA-256: 8ab13b5e8021712c20490e644b58fc84155fd3b080317cbd424faa9e19c392f7
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-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://lozipotod.ru/wix?keyword=4-6-2+locomotive+roster PDF link annotation
    • https://xumabilere.weebly.com/uploads/1/3/1/1/131163638/807dfb5618c.pdfIn PDF document text
    • https://cdn.sqhk.co/bajowekununa/jfjdPij/basiloboxufadobixomifenuw.pdfIn PDF document text
    • http://tiktokfrance.fun/speed_test_filebc3ku.pdfIn PDF document text
    • http://istlan.space/bijotalusodibupudapugr2p6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369328/normal_6034351bea8ce.pdfIn PDF document text
    • https://cdn.sqhk.co/wimiwupo/irh1Cgh/30577108038.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369901/normal_603a843a65d18.pdfIn PDF document text
    • https://cdn.sqhk.co/judixixelof/hdhjhhy/newatebazezenafedade.pdfIn PDF document text
    • https://fogojokiverowur.weebly.com/uploads/1/3/0/9/130969702/guwomajawe.pdfIn PDF document text
    • https://zikovawezuve.weebly.com/uploads/1/3/1/1/131164456/83c1db661.pdfIn PDF document text
    • https://jesisime.weebly.com/uploads/1/3/4/8/134886507/guxowaweduvu.pdfIn PDF document text
    • http://shoop-fh.ru/fopejizefigejugkojik.pdfIn PDF document text
    • https://cdn.sqhk.co/jibezilesu/ijjhcic/talking_pug_dog_commercial.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416798/normal_6029871b8b0c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415334/normal_5fd147ba517db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457862/normal_60497c7326975.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9e1e9198-0fe7-4103-8084-fdcc6befb8d5.filesusr.com/ugd/2f7815_dcea1db343054c058182abe9fa68f6fa.pdf?index=trueIn PDF document text
    • https://e809654a-a95b-4dbc-a338-24085255a2f8.filesusr.com/ugd/1b6cec_0cabec2992a24823b1a44a4cbd2268c7.pdf?index=trueIn PDF document text
    • https://1e1f235d-56dd-4976-b20d-d38e3fe7b172.filesusr.com/ugd/210b45_49f56e2a6bfe4f038377b70fa0baf6ab.pdf?index=trueIn PDF document text
    • https://9abff256-b119-4e75-a612-dfc075f5428e.filesusr.com/ugd/c73517_b3f1c6e622474c4bb34cc71f45a31220.pdf?index=trueIn PDF document text
    • https://247e77cc-5367-4382-8586-7c5891409f42.filesusr.com/ugd/2dbf5a_31065b73b70c45838f1f3f9fd58571c0.pdf?index=trueIn PDF document text
    • https://e3c65705-3664-417e-97b1-2ac29bfab8bd.filesusr.com/ugd/6a5da5_ef3554fff0fa4087a8a9bd2443437956.pdf?index=trueIn PDF document text
    • https://d80868e2-5d34-4dda-9345-0396294a35aa.filesusr.com/ugd/f9fac6_339c6adf42b346eaa0b1e332e4dce954.pdf?index=trueIn PDF document text
    • https://d572dbd6-ec42-402e-884a-3db6daac2318.filesusr.com/ugd/6a558d_d8c3e5c5f6aa4d29a2a86fed61429710.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_off0000f2e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E7 5104 bytes
SHA-256: dcf03d5f2b13579c72462679ab33332c33fc2a9715395aa0c139c1be6453553c
font_01_sfnt_off00010449.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10449 10528 bytes
SHA-256: 5d6a0c1463787e41cc74420b57e8eaf0205f772cb16cbcecbed4d48876a59fe4