Malicious PDF — malware analysis report

Static analysis result for SHA-256 07291da54ef1874b…

MALICIOUS

PDF

80.9 KB Created: 2021-04-07 09:46:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 4917a001bafcb4654ee4c0ab0eab0ea7 SHA-1: b65716af68a72212ac33e8b307e313af90071c72 SHA-256: 07291da54ef1874b94a5f493356bfc47a85ac436ce3b67a871fd67605c86535f
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 0.9993

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://bologen.ru/strik?utm_term=samsung+top+loader+washing+machine+clean+drain+pump PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4482418/normal_606b0cab3066f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479445/normal_603827bf6e0e1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471273/normal_5ffbad87e986b.pdfIn PDF document text
    • http://bitopikagigev.iblogger.org/british_english_vs_american_english_exercises.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488842/normal_5ff06bab7590f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458125/normal_5fe165d6a1205.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408352/normal_5fd0971d0006e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377679/normal_6017336f21884.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379473/normal_5ffac2b1bf831.pdfIn PDF document text
    • http://penutiponexeb.iblogger.org/sociability_scale.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426823/normal_5feef58627ffb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://21c505bb-01ca-4817-a549-4ed1ebba5040.filesusr.com/ugd/7d7105_fdb8ac947ab641b5923dd155e5df6bc7.pdf?index=trueIn PDF document text
    • https://720c7b34-a033-4bf0-83ea-6be17de98aa2.filesusr.com/ugd/03ef8e_d132035a10c64bfdb30171fdc98bf682.pdf?index=trueIn PDF document text
    • https://8ac5c8e1-9174-427d-95c2-90bebb9f105a.filesusr.com/ugd/44b221_f90ef7196a55416e9639bb8ded5304ef.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pasawe/tejazanozu.pdfIn PDF document text
    • https://s3.amazonaws.com/zedudo/bufefolaloxobedafavovemu.pdfIn PDF document text
    • https://a98f38e8-5810-4fc9-be6a-c3d78c7c4f9f.filesusr.com/ugd/921909_4510016b53ba400099958d83d733781e.pdf?index=trueIn PDF document text
    • https://b70645e9-42d7-44c6-80f2-f165c8819e8d.filesusr.com/ugd/3f1130_b46eac4967534f228b3270eae2b3b515.pdf?index=trueIn PDF document text
    • https://368051e9-4199-40ea-b9a2-dc6e6f83cb3b.filesusr.com/ugd/6260fe_f54a4658a25e4f8a9d5ca666e9080c7e.pdf?index=trueIn PDF document text
    • https://969948a0-d7f7-4827-958e-a3856fee42d4.filesusr.com/ugd/9d40bc_6e6f85c188c643c98363ee117d107c4e.pdf?index=trueIn PDF document text
    • https://d190c387-1498-4382-a59e-98d1a0a9794c.filesusr.com/ugd/a91264_c40de6d2ebe44d57ad16efbbb6be1d06.pdf?index=trueIn PDF document text
    • https://f538c46d-6aff-4997-95da-320e40b30403.filesusr.com/ugd/262ba4_6020d9f59dd0425bb0c6dbb0faf5f85c.pdf?index=trueIn PDF document text
    • https://9e77dbea-16d6-438e-9859-4a68c5388828.filesusr.com/ugd/3225da_8690a71dfbc7464688b3ffd901e80417.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zosevid/cartoon_animators_sheet_daily_themed_crossword.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_off0000fad4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD4 5680 bytes
SHA-256: 0904fd61dccdf7c30f7fe1c5fbf6952c2afa50e87c175775eb68c957628cce2e
font_01_sfnt_off00010e14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E14 11060 bytes
SHA-256: a9f7659591b34684e5dfc193803bdd537e5b0c586b174e09172ca5d183edbbcb