Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e57384b3553bc44…

MALICIOUS

PDF

70.5 KB Created: 2021-03-20 04:05:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 1be7f66dd89551b2e9b4f58383188584 SHA-1: cbfd42a1e4b4969a0beed34e04ebbeaffd505cde SHA-256: 7e57384b3553bc4489a34e40d4cf55e43bf9a7c04692cdfd22244c2fbb167522
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 0.9998

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://seumenha.ru/strik?utm_term=how+many+calories+in+a+dunkin+energy+punch PDF link annotation
    • https://cdn.sqhk.co/diwewiduvaz/eTjdYhc/pocket_document_camera.pdfIn PDF document text
    • https://cdn.sqhk.co/tutogalubete/BR63kgi/91685138115.pdfIn PDF document text
    • https://cdn.sqhk.co/lutuganoda/bhjhbid/45733977162.pdfIn PDF document text
    • https://cdn.sqhk.co/tixukiko/ijhggxT/fajumofon.pdfIn PDF document text
    • https://topifovav.weebly.com/uploads/1/3/4/5/134595147/00b4cabb4e04.pdfIn PDF document text
    • https://cdn.sqhk.co/tulazofava/hiChgx7/lucky_dube_song_lyrics_together_as_one.pdfIn PDF document text
    • https://silemixijotin.weebly.com/uploads/1/3/4/4/134463531/4947080.pdfIn PDF document text
    • https://cdn.sqhk.co/ripalufix/ghMgeSg/91512815807.pdfIn PDF document text
    • https://cdn.sqhk.co/pedajobu/jgjjjgM/rodonasidaposilazi.pdfIn PDF document text
    • https://cdn.sqhk.co/murerezusa/jdANa2f/miris.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://eaae50f7-3b1c-4f1b-9b3c-e2a48377569d.filesusr.com/ugd/b96e41_496d30d5a87d4cbab2a55d89fc3894d7.pdf?index=trueIn PDF document text
    • https://6593eeda-10fe-4128-810f-cbbc79f0a4f8.filesusr.com/ugd/c0a4bf_b83eba1815b448afbf257b53b37daba5.pdf?index=trueIn PDF document text
    • https://e4586023-485a-43f1-9451-2d404684c5b7.filesusr.com/ugd/95ff22_94ebda03baa446aa83326212dca593f1.pdf?index=trueIn PDF document text
    • https://cf176ec6-4820-456b-adf9-61e5f06c968f.filesusr.com/ugd/43d598_c9f9da7716184b47ba96199d6c75fbfc.pdf?index=trueIn PDF document text
    • https://44407f20-7244-4107-9544-84d8151b6f9a.filesusr.com/ugd/8508de_7ee4379654d04a5782673d601db66d74.pdf?index=trueIn PDF document text
    • https://3633ae4e-9acc-45df-885e-1bfa1481cb44.filesusr.com/ugd/e73054_c7a70d4036be42d5905fcdbd7c94b169.pdf?index=trueIn PDF document text
    • https://0c7b1e5d-10e9-4c66-9a64-57e6babc74f3.filesusr.com/ugd/6b59ba_60b68382012e46bc9e4f21839a179515.pdf?index=trueIn PDF document text
    • https://96a9e3af-f0c3-4048-9e6c-0ad8da3c6018.filesusr.com/ugd/15d534_e5198026804e4c24a42a90e5cd9078bb.pdf?index=trueIn PDF document text
    • http://ridezaxepaked.rf.gd/annotate_app_android.pdfIn PDF document text
    • http://zegudonokor.epizy.com/gikuvofo.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_off0000d5ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5EE 5704 bytes
SHA-256: 3f77640562502ae8c9d59645771b765d26b950a79251042cceb8ce06c16c0318
font_01_sfnt_off0000e949.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE949 10348 bytes
SHA-256: 990b4dc9540d95c257c0d15eab3c872c00fa2fd29d6ee52866d3001a34028092

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