Malicious PDF — malware analysis report

Static analysis result for SHA-256 078703def6f2733b…

MALICIOUS

PDF

71.2 KB Created: 2021-01-09 17:12:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: a2c67a2d3da4179cd5180ee2238eb261 SHA-1: 0a0ede7159c92afafe1a7d4ee984490c705c1a30 SHA-256: 078703def6f2733bb742317ab1f8b5201d45caddecd6110fdeae98df6f501138
186 Risk Score

Malware Insights

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

This PDF was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains a large number of external links, many pointing to disposable domains, characteristic of a link farm. The embedded URLs suggest a potential phishing or malware distribution vector, possibly leveraging SEO tactics. No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

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://traffset.ru/aws?utm_term=acid+bases+and+ph+lab+report PDF link annotation
    • https://talunijepi.weebly.com/uploads/1/3/4/5/134599753/digapesifu.pdfIn PDF document text
    • https://wudatoguji.weebly.com/uploads/1/3/4/8/134885495/4537963.pdfIn PDF document text
    • https://pezojafabeton.weebly.com/uploads/1/3/4/4/134402057/famotapuw.pdfIn PDF document text
    • https://wopusuxosar.weebly.com/uploads/1/3/4/5/134583764/desukepu_wasosoz_zabader.pdfIn PDF document text
    • https://muzafudopabebex.weebly.com/uploads/1/3/4/8/134865208/b6866274f77.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450047/normal_5fd6145e21aa5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369318/normal_5fc95455088a9.pdfIn PDF document text
    • https://tusidotug.weebly.com/uploads/1/3/4/4/134482214/b079372.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387240/normal_5fdfda77f327a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382621/normal_5fcb35b199568.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lorifumofelu/tricky_math_education.pdfIn PDF document text
    • https://s3.amazonaws.com/kubedukowug/hinkhoj_dictionary_free_apk_for_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/napisakaluja/mugizibowosujorazikuxux.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_off0000d834.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD834 5288 bytes
SHA-256: 5f0097be94102384451ed431ab2446b4ec4750d96be7ac906c28572b5de5ca91
font_01_sfnt_off0000ea22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA22 11236 bytes
SHA-256: 0199765686e8034e97147d1158edf2378d2fe4af2a9058b2909367d7f78f5907

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