Malicious PDF — malware analysis report

Static analysis result for SHA-256 636ac21cd9f14d3e…

MALICIOUS

PDF

96.1 KB Created: 2020-11-23 14:44:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 582ca818541f28cbb7d2a16820786a9a SHA-1: 807a1dd3fdc236bdd471406d0abcb9d24e3c901b SHA-256: 636ac21cd9f14d3e149271f0c3d6ff9b9f2101c311abe2384aa828f3044721d4
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many pointing to disposable hosting services, indicating a link farm designed for SEO manipulation or to host malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the PDF structure itself is indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafffi.ru/123?utm_term=garfield+and+friends+pig PDF link annotation
    • https://jitolubupiloz.weebly.com/uploads/1/3/4/6/134637312/wuzezixekizab_zinozowejewam_rekutuzupabelib.pdfIn PDF document text
    • https://bekijarodik.weebly.com/uploads/1/3/4/6/134617997/7237958.pdfIn PDF document text
    • https://rawudirujitasep.weebly.com/uploads/1/3/4/5/134588445/siraw.pdfIn PDF document text
    • https://debekekuwafa.weebly.com/uploads/1/3/4/4/134473288/vadej.pdfIn PDF document text
    • https://boxomuti.weebly.com/uploads/1/3/4/0/134016719/3907184.pdfIn PDF document text
    • https://pisanofinupu.weebly.com/uploads/1/3/1/4/131437881/6dcacf34f7bb.pdfIn PDF document text
    • https://gimejexoxixaza.weebly.com/uploads/1/3/1/8/131872185/wotareropajewub.pdfIn PDF document text
    • https://xufuluzigi.weebly.com/uploads/1/3/4/2/134266078/7359675.pdfIn PDF document text
    • https://kovelikazaw.weebly.com/uploads/1/3/4/7/134705675/392de6b01d.pdfIn 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/912e99f2-ff1a-463f-9fe4-7343d51c3e78/genunokulofelosagenigek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8fbc58a-d2cd-4d1e-aa22-c00cb3fa63a6/6660925447.pdfIn PDF document text
    • https://s3.amazonaws.com/jamuluvuvava/pneumovax_23_vaccine_vis_sheet.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_off00013c0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C0D 5240 bytes
SHA-256: fda2b5ee2c577bab84c79e717c62d19de14402698a023464969b2d1550693246
font_01_sfnt_off00014df3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DF3 11324 bytes
SHA-256: 596acfc3c6d377bfbfd20b1b26e76cce34174542a5728ed3d1d04814b053e462

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