Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1d631b863374e12…

MALICIOUS

PDF

85.1 KB Created: 2020-11-19 22:44:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3e01768a7be8856c2abd46916264f2ab SHA-1: 987db9922ebb5c44d494dd6503395645f2ebc00f SHA-256: a1d631b863374e12abe9a1174d15a6311fd66343b547bf7cce67332649c828c5
156 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many pointing to potentially malicious domains, as indicated by the 'PDF_SEO_LINK_FARM' and 'PDF_URI' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the presence of embedded URLs and the overall structure point towards a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/123?utm_term=the+discovery+of+the+unconscious+pdf
    • https://kejijasorakabil.weebly.com/uploads/1/3/4/3/134311956/jurolifafiz.pdf
    • https://kutufexefe.weebly.com/uploads/1/3/4/6/134695169/65be5fd579ce7b3.pdf
    • https://ruzizoradum.weebly.com/uploads/1/3/4/3/134317959/jimog_webaxuvewimu_xatize.pdf
    • https://jumemovelavubar.weebly.com/uploads/1/3/4/5/134516611/geveb_tajus.pdf
    • https://lazekikobetilof.weebly.com/uploads/1/3/4/4/134443651/4948715.pdf
    • https://zumukematil.weebly.com/uploads/1/3/4/7/134716366/2144211.pdf
    • https://nadazilagola.weebly.com/uploads/1/3/4/3/134314388/3fbb55.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/241927f5-1171-452c-8a6a-01ba6dc55c46/freezer_burn_ice_cream_while_pregnant.pdf
    • https://uploads.strikinglycdn.com/files/6d88c575-21e3-4d00-ac16-6e6f2d16d8fa/86031620787.pdf
    • https://uploads.strikinglycdn.com/files/c28a5043-9a38-467f-bc97-6004543fbdb6/6575051096.pdf
    • https://uploads.strikinglycdn.com/files/27430029-eb2a-4b8e-b059-f5e5d68f7685/80834678638.pdf
    • https://uploads.strikinglycdn.com/files/901edde2-12cb-4bd8-b329-cfd5160e7bb0/tikijasogadigisenig.pdf
    • https://uploads.strikinglycdn.com/files/f16c8236-b259-44d4-a162-b788db5a2188/cuisinart_ice-30bc_replacement_bowl.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa0f.bin
efceece2370dc20657d27127b132a840cc1b84b9902973284763a9492fa0740c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA0F 5112 bytes
font_01_sfnt_off00010b86.bin
3fd73184933a94583d18e09024e3265973a5b6335e0f55b9862849ffef965263		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B86 11068 bytes
font_02_sfnt_off0001317d.bin
53a0e130f2371045e1ebbcca70a024b76227e3615a461c216ef7b7af1994dcbb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1317D 16196 bytes

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