Malicious PDF — malware analysis report

Static analysis result for SHA-256 a77cff31e67a0093…

MALICIOUS

PDF

77.7 KB Created: 2020-12-30 08:23:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: b9663ffcee693dbc53aa1f17ef8b3c50 SHA-1: b869b3b9336f4d9a53902183ffeec929a708e557 SHA-256: a77cff31e67a009304e1173d4483e7ee6ec2b0d69e680ceea3c1fb801287a4f0
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The document body, though heavily corrupted, contains text related to visiting Florida beaches, likely a lure to direct users to the malicious URLs.

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://trafficel.ru/strik?utm_term=visit+florida+beaches+open PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4454426/normal_5fa94a6f025f7.pdfIn PDF document text
    • https://cdn.sqhk.co/peferitukofa/jgUkOC6/fuditogakeduw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407086/normal_5fe59bafdb924.pdfIn PDF document text
    • https://rasisepuwefu.weebly.com/uploads/1/3/4/6/134678142/3c63c1ccc9.pdfIn PDF document text
    • https://cdn.sqhk.co/gewanunu/gcuicwh/love_story_author.pdfIn PDF document text
    • https://satobolusiv.weebly.com/uploads/1/3/1/3/131398412/6602156.pdfIn PDF document text
    • https://lipofodimeduwep.weebly.com/uploads/1/3/0/8/130813747/gasuvanok_zizeribukawugor_wigope.pdfIn PDF document text
    • https://boxatikavizag.weebly.com/uploads/1/3/4/6/134680825/biwatanuwenitem.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456132/normal_5fb30983c0d69.pdfIn PDF document text
    • https://cdn.sqhk.co/lidupusumoj/foggiah/notes_in_spanish_podcast_translation.pdfIn PDF document text
    • https://zeburunonuf.weebly.com/uploads/1/3/4/4/134458398/jepobafuwobomaz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472763/normal_5fad91e0b6628.pdfIn PDF document text
    • https://dapunilak.weebly.com/uploads/1/3/4/5/134506399/votesexoxiju-momakibemil-vobodevisupob.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
    • 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_off0000e5c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C5 5136 bytes
SHA-256: 7cb232bfd1366032802da73ed43146966226b90509b59b1c5aa3793f19e109f7
font_01_sfnt_off0000f725.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF725 10984 bytes
SHA-256: dd9ab10535ef07373c0bf16a1f8196e40a8b10758056f32206c2afdee3a54d5d
font_02_sfnt_off00011c06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C06 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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