Malicious PDF — malware analysis report

Static analysis result for SHA-256 5021760da7fdedff…

MALICIOUS

PDF

74.9 KB Created: 2021-02-21 01:11:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: bf7a20abdeca3fe003e457e524835502 SHA-1: ef715a94e760ec6fac7986af1df5e0407975a3b5 SHA-256: 5021760da7fdedffbdc68cb4f465f8090dc6e6da9ac52e59603af7ff4a2730c8
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a PDF link farm. This heuristic, combined with ML classification and ClamAV detection, strongly suggests malicious intent. While no scripts were explicitly extracted, the presence of numerous external URLs indicates the document's primary function is to redirect users to potentially malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://baarspo.ru/123?utm_term=is+model+y+higher+than+model+3 PDF link annotation
    • http://pagebake.com/grohe_faucet_replacement_partsqh73r.pdfIn PDF document text
    • https://pakilimog.weebly.com/uploads/1/3/4/3/134363837/giwajomibigip-kozitelago.pdfIn PDF document text
    • https://gizutiki.weebly.com/uploads/1/3/4/4/134478998/170530.pdfIn PDF document text
    • http://sis-paypal.com/lenovo_ix2_firmware_download6is3k.pdfIn PDF document text
    • https://cdn.sqhk.co/sadetujadufi/Egfcbje/rap_maker_premium_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/wiparodub/jDljjie/tennessee_titans_covid_positive_players.pdfIn PDF document text
    • https://cdn.sqhk.co/zujarepifej/fyFgdge/bullet_for_my_valentine_crazy_train_album.pdfIn PDF document text
    • https://cdn.sqhk.co/fimegasaz/giUOaEy/name_generator_male_dog.pdfIn PDF document text
    • http://salonvarna.com/feneniludukenesepuwapadom0jfia.pdfIn PDF document text
    • http://mebel-albero.ru/catering_company_profile_templatez8llh.pdfIn PDF document text
    • https://fukuperuka.weebly.com/uploads/1/3/4/8/134883813/9926345c41182.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/wovugi/anime_cyborg_kuro_chan.pdfIn PDF document text
    • https://s3.amazonaws.com/kozewuposoridil/36997814160.pdfIn PDF document text
    • https://s3.amazonaws.com/bolovopizonuki/dsx-_5000_cableanalyzer_datasheet.pdfIn PDF document text
    • https://s3.amazonaws.com/dosalapasenow/whats_another_word_for_conventional.pdfIn PDF document text
    • https://s3.amazonaws.com/julexekubaj/call_of_cthulhu_character_sheet_excel.pdfIn PDF document text
    • https://s3.amazonaws.com/votawawo/71729398915.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_off0000e78c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE78C 5444 bytes
SHA-256: 4b82d74d4b6f9ada8e6eccc987c4b0e4ebac7fa47cb0de7960e09b33e037ffc4
font_01_sfnt_off0000f9e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E8 10812 bytes
SHA-256: 58d0b8a4ecac258cd1cff35a9f1e96b708ed0d3d2219dcab71e0c5057928d7e2

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