Malicious PDF — malware analysis report

Static analysis result for SHA-256 dca35d59294af015…

MALICIOUS

PDF

65.6 KB Created: 2020-12-31 17:34:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: bc4cdc67336e3d2968d812a67532c5bb SHA-1: b355c6beb3456f2b5b56e7de2efbb2d05268eb5b SHA-256: dca35d59294af015dffe6e3de7d41516f8d8382896f14f3221a70d319d327209
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting a malicious intent to redirect users. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded URIs indicate a phishing or malicious redirection attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://trafftec.ru/123?utm_term=james+taylor+carolina+in+my+mind+chords PDF link annotation
    • https://nujetamewude.weebly.com/uploads/1/3/4/8/134881912/mobavaz.pdfIn PDF document text
    • https://robaralimojo.weebly.com/uploads/1/3/0/8/130814718/xexujexekifono.pdfIn PDF document text
    • https://sararilaba.weebly.com/uploads/1/3/1/4/131482808/jovisa-xamilofonu-buxob.pdfIn PDF document text
    • https://cdn.sqhk.co/mugejufunij/e80haMD/86027862878.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/mozirolinitaje/hd_movie_site_list_for_mobile.pdfIn PDF document text
    • https://s3.amazonaws.com/wusigipufuvowix/zijiladupubekiwawexin.pdfIn PDF document text
    • https://s3.amazonaws.com/fulomufimikim/minecraft_equivalent_exchange_2_download.pdfIn PDF document text
    • https://s3.amazonaws.com/peveziwoguxuzam/bajejasowewozebidesidaze.pdfIn PDF document text
    • https://s3.amazonaws.com/sulasatevirexo/kmspico_activator_bagas31.pdfIn PDF document text
    • https://s3.amazonaws.com/wipotegadodorek/crossword_answer_for_distinguished_or_famous.pdfIn PDF document text
    • https://s3.amazonaws.com/bisute/tanaledegipixaribaj.pdfIn PDF document text
    • https://s3.amazonaws.com/pujinit/52070140135.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_off0000c44d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC44D 5268 bytes
SHA-256: b7abce0472576965edf86e0bd50f761c6ef8aec85955d930a06c856f5219765b
font_01_sfnt_off0000d60d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD60D 9844 bytes
SHA-256: a17200d8925966179a69e7428d649aed53fc54e1207abac36cc011bd76fed597

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