Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8ff6d6d4b3b621a…

MALICIOUS

PDF

123.1 KB Created: 2021-05-31 01:57:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: d1879eddb771dbc9bd4607046baa6aab SHA-1: af5a246aafa622f9350ed24e76fdfffe85335147 SHA-256: a8ff6d6d4b3b621a623422a6275c906e1ffb93b032986d5aa1112c9f707f4d51
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9999

Heuristics 5

  • 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.
  • 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://midufefew.ru/strik?utm_term=endendigu+kannada+movie+mp3+songs+free+download+320kbps PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4390382/normal_5fe715cab3c6d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377647/normal_6037ae43611f6.pdfIn PDF document text
    • https://kutowovazamil.weebly.com/uploads/1/3/4/3/134362820/fotasemivividutez.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402486/normal_5fdbc3329e28f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476782/normal_602b0b7659d76.pdfIn PDF document text
    • https://faxasuxudoxo.weebly.com/uploads/1/3/2/6/132695360/bufavidavubadab-xijefowizu-zuritawavuwo.pdfIn PDF document text
    • https://lidalukedewad.weebly.com/uploads/1/3/4/6/134664428/mexosegotawozukakol.pdfIn PDF document text
    • https://guladusive.weebly.com/uploads/1/3/0/9/130969442/nusafelewo.pdfIn PDF document text
    • https://zapokeboxopi.weebly.com/uploads/1/3/0/7/130776852/5f9bef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502920/normal_60262fe90ef9e.pdfIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb497f4b-2ee4-43c7-903a-e5f62ab98a99/95720589585.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be9e8415-a7cf-4554-aa48-4bc726607dcd/laxep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae3e13f4-8447-4bea-8a88-ba196f4003db/gosaza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b43c1e76-d7fb-4cf1-aa98-263fceaca016/94271692764.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6316680-0ed8-4240-b826-9cf09038a92b/36303254559.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b703463c-6243-4b7e-8e2a-168d26d91bfb/39820503192.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4069ec75-fe89-4cb4-880d-891fd8d2291e/pelemiwoko.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8966d4e-dda4-4691-bc28-1f4fbef0bf82/xiaomi_fengmi_4k_laser_projector_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a41375f-8357-4287-8bd7-35b66c1cdd3a/nizaguwofepilemufu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2165223-01d0-4b3a-afc3-8c5468648295/simplifying_polynomial_expressions_worksheet_kuta.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000156ad.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x156AD 57352 bytes
SHA-256: e8066259944a043544f00e3eab748f192054e31f5c12a351c8a06faba838bd4e
font_00_sfnt_off000141d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141D6 6112 bytes
SHA-256: 18dc62d9e828692c475d1733a9ea3b548ea0eba4895b141e30abdceca3fc4935
font_02_sfnt_off0001b2e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B2E1 12944 bytes
SHA-256: b359f8b4f4e4b9798be980a5439aef6a458ba40ae0c07b525dc5bd7e2507947f

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