Malicious PDF — malware analysis report

Static analysis result for SHA-256 aabdc2ef6b492c3c…

MALICIOUS

PDF

79.7 KB Created: 2021-04-07 10:06:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: d9817776456a255fd9f785fff8503c51 SHA-1: 539aea03d60226cf73a5d8d3a36437af1efce4b4 SHA-256: aabdc2ef6b492c3c72bc8328275e71b7a296fecc8fbdcb396b498f00e565d4d4
186 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 0.9998

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://crophysi.ru/strik?utm_term=wahl+cordless+clippers+instructions PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4470526/normal_5fd0ecd97abaf.pdfIn PDF document text
    • https://nesexabaxurozij.weebly.com/uploads/1/3/4/8/134898102/751656.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480589/normal_5fce619d17d83.pdfIn PDF document text
    • http://xepewifub.mygamesonline.org/50043042495.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379482/normal_600d8e21ae23b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450721/normal_5fe95c289899b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450151/normal_5fce9e324e0f1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413223/normal_603b2b95e5d0f.pdfIn PDF document text
    • https://nofabirudop.weebly.com/uploads/1/3/4/4/134455392/kukolinovuv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490269/normal_6032793f97d31.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405642/normal_5fc5bb13e7a7b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470016/normal_606415d124ab3.pdfIn PDF document text
    • http://mowogaw.mypressonline.com/bokitis.pdfIn PDF document text
    • http://fefiwizam.sportsontheweb.net/renoxelewotewobiwetovod.pdfIn PDF document text
    • https://viwoxinuzozaxa.weebly.com/uploads/1/3/1/6/131636825/tobotadefumano.pdfIn PDF document text
    • http://pokezokebawi.mygamesonline.org/pamiletipikivani.pdfIn PDF document text
    • https://rovagurepuj.weebly.com/uploads/1/3/1/8/131856033/54063952.pdfIn PDF document text
    • http://vurujupafowutox.mypressonline.com/49366762194.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://s3.amazonaws.com/dakebesuvum/4146394500.pdfIn PDF document text
    • https://s3.amazonaws.com/xukanomarexumu/4474271661.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED2B 5056 bytes
SHA-256: a83c6c3c3ec1ad2495807a3fabdd46162ba3d0667fa883cc30f382ecc4bbebae
font_01_sfnt_off0000fe54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE54 10956 bytes
SHA-256: c9ad158d153f1d48d66a3b1921a79f4b620b3081fe8267ef73ccf9300ee5d490
font_02_sfnt_off00012368.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12368 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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