Malicious PDF — malware analysis report

Static analysis result for SHA-256 980167a83792f56f…

MALICIOUS

PDF

73.0 KB Created: 2021-02-13 15:17:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: c20ac143e252d7a2ff40937738809051 SHA-1: 6b19738b5cd1f5e06c84cbb7731e64c40d31a83e SHA-256: 980167a83792f56f0e9284a0d5a8aa0d98e9288b53820263013ab5bc956ce6a5
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, suggesting a link farm or redirection scheme, with one heuristic specifically identifying it as a 'PDF_SEO_LINK_FARM'. The presence of embedded URLs and the overall structure point towards an attempt to direct users to potentially harmful content or for SEO manipulation purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/123?utm_term=km+action+hive PDF link annotation
    • http://sponsor.rest/jump_zombie_chapter_250mz49.pdfIn PDF document text
    • https://wakukaxowemaba.weebly.com/uploads/1/3/5/3/135303752/sekopafopebepowi.pdfIn PDF document text
    • https://zeloruzo.weebly.com/uploads/1/3/5/3/135349371/c1364232.pdfIn PDF document text
    • http://braco.ru/exterminate_all_the_brutes_sven_lindqvistqq9t9.pdfIn PDF document text
    • https://vafiradas.weebly.com/uploads/1/3/3/9/133988778/fiwoga.pdfIn PDF document text
    • http://topfrag.rip/movie_counter_hd_free_movieduo2a.pdfIn PDF document text
    • https://tigerabedudutid.weebly.com/uploads/1/3/5/3/135304069/5788947.pdfIn PDF document text
    • http://avtovishki-msk.ru/los_88_peldaos_del_exito7wmqe.pdfIn PDF document text
    • https://regezubigif.weebly.com/uploads/1/3/5/3/135320660/popesivabufisarol.pdfIn PDF document text
    • https://jovavogi.weebly.com/uploads/1/3/4/5/134597399/3063516.pdfIn PDF document text
    • https://guxemufisi.weebly.com/uploads/1/3/2/7/132710659/658699.pdfIn PDF document text
    • http://vizuwubifazezix.22web.org/online_animation_free.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://benobex.epizy.com/nozigikototofazuf.pdfIn PDF document text
    • http://xaxelajifamukas.rf.gd/34557033414.pdfIn PDF document text
    • http://zebofazedixa.rf.gd/10452500355.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_off0000e2d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D7 4760 bytes
SHA-256: 2edfccc43725a98b9c24e00faacaf16c3d7e6a307bc75753cc5816c857cfcc07
font_01_sfnt_off0000f2ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2EF 10796 bytes
SHA-256: e3ac8a4837a25731d743dc2eba743393db74d815b3fb6a3831a7e02b9260ce1c

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