Malicious PDF — malware analysis report

Static analysis result for SHA-256 95a8c42be58c91b8…

MALICIOUS

PDF

61.0 KB Created: 2021-01-09 22:51:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: ee4f367793ce9b2b122b94e35af70f4b SHA-1: 0a7d31db7bea875e3a41627c0becd01cfe590a2a SHA-256: 95a8c42be58c91b88bedcb946210511c941aa094139ee94869179aa10476e8ef
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, appears to be a lure related to a weather report, likely to trick users into clicking the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://trafffi.ru/aws?utm_term=kalispell+montana+weather+report PDF link annotation
    • https://mufedagejex.weebly.com/uploads/1/3/4/7/134726032/9c521.pdfIn PDF document text
    • https://kipowiginudi.weebly.com/uploads/1/3/1/3/131383469/9825293.pdfIn PDF document text
    • https://xadaxegaku.weebly.com/uploads/1/3/4/4/134444747/64a69c7.pdfIn PDF document text
    • https://gotugutulado.weebly.com/uploads/1/3/4/6/134648793/vekuzitilabepiwumale.pdfIn PDF document text
    • https://gopaposoxawa.weebly.com/uploads/1/3/0/7/130740193/vuxiwipewezisozum.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413108/normal_5f9df832e2812.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447271/normal_5fbf5d77ceb37.pdfIn PDF document text
    • https://rubajamepufukav.weebly.com/uploads/1/3/4/4/134432722/8142542.pdfIn PDF document text
    • https://vamekatowozi.weebly.com/uploads/1/3/0/8/130814347/3b853.pdfIn PDF document text
    • https://suzagosezamonu.weebly.com/uploads/1/3/4/4/134446802/6725605.pdfIn PDF document text
    • https://japekubejur.weebly.com/uploads/1/3/0/7/130775222/dosobunakun_dapapex.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/jaxesabi/zejelagazajometigo.pdfIn PDF document text
    • https://s3.amazonaws.com/zeworibuzoza/raf_tec_informatica.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_off0000b669.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB669 5120 bytes
SHA-256: 36cb4e14b9cad008d549c8be42f069d251c035917f612f55e63b79e0bfdab0f0
font_01_sfnt_off0000c7bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7BC 9388 bytes
SHA-256: 788971938a277829cff566714d35f5002debce9be9b9045c76503f46f224c594

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