Malicious PDF — malware analysis report

Static analysis result for SHA-256 0033d879161e4ee2…

MALICIOUS

PDF

74.6 KB Created: 2021-02-06 08:38:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: db3c83d7103d4a520b7a49c4de611f86 SHA-1: 53cf4a4654441e631ed175754344c7efd0bff425 SHA-256: 0033d879161e4ee2c5134d1dce6b25017c2770502beb5aaedd3be4b7d66cb780
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified as a link farm, with one primary URL pointing to a suspicious domain. ClamAV and ML classifiers strongly indicate malicious content, specifically a phishing trojan. The presence of embedded URLs and the PDF structure suggest an attempt to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://maypoin.ru/aws?utm_term=the+enlightenment+worksheet+icivics+answers PDF link annotation
    • https://cdn.sqhk.co/nigulavax/hjdKoKX/palavu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486221/normal_600093e21a782.pdfIn PDF document text
    • https://cdn.sqhk.co/povuguzuloga/hOusggM/jetejarojox.pdfIn PDF document text
    • https://cdn.sqhk.co/romilononove/Rkjajjy/85166349403.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483365/normal_600afd22ee02b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502178/normal_5fdbecba6c9b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485570/normal_5fe88c7a92880.pdfIn PDF document text
    • https://cdn.sqhk.co/tenokesime/yiehhii/home_assistant_nest_doorbell.pdfIn PDF document text
    • https://sibevuguz.weebly.com/uploads/1/3/4/8/134859718/82197.pdfIn PDF document text
    • https://cdn.sqhk.co/gakilofod/ia3LggF/8594535470.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393349/normal_5fdd5e571d78b.pdfIn PDF document text
    • http://tularafujebok.iblogger.org/receipt_form_template_excel.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/paxuvagal/83455401829.pdfIn PDF document text
    • https://s3.amazonaws.com/faluzotixupi/96694462877.pdfIn PDF document text
    • https://s3.amazonaws.com/jeduzizonox/64831436989.pdfIn PDF document text
    • https://s3.amazonaws.com/bupesejirijejus/alder_lake_wi_fishing_report.pdfIn PDF document text
    • https://s3.amazonaws.com/zoromexemuzid/english_alphabet_pictures_free.pdfIn PDF document text
    • https://s3.amazonaws.com/tobovunoberiki/absolutely_free_vpn.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_off0000dd35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD35 5376 bytes
SHA-256: 04da901fea9f3a39f2d6209ad4bce831aeabe4759fc87e3928f093ad76540dd2
font_01_sfnt_off0000ef70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF70 14556 bytes
SHA-256: bab5356a3b016642742b964ee20e52def719c32b5985286883b3e28aa73257c9

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