Malicious PDF — malware analysis report

Static analysis result for SHA-256 efc8c409dfeccb95…

MALICIOUS

PDF

85.7 KB Created: 2021-02-08 17:13:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: d433b22964bc605ac8e05aff4ae5d380 SHA-1: e271db3d9e9543a1098e39753c18d99e9eac8415 SHA-256: efc8c409dfeccb95b562411891000ccf6c2246499c663c9e77e5c8bdae62a6fc
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains or link farms, indicating a likely SEO manipulation or phishing campaign. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful content.

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/aws?utm_term=vertex+form+of+quadratic+function+meaning PDF link annotation
    • https://giretalude.weebly.com/uploads/1/3/4/6/134677333/466562.pdfIn PDF document text
    • https://vefapabawi.weebly.com/uploads/1/3/0/7/130740427/ramuledonobat_domakedixenef.pdfIn PDF document text
    • http://webmastervlad.ru/free_bible_crossword_puzzles5otgt.pdfIn PDF document text
    • https://sanakutubifave.weebly.com/uploads/1/3/4/8/134849958/dosafe.pdfIn PDF document text
    • https://cdn.sqhk.co/nesadatifu/8MTgd2x/pentagon_shape_meaning_in_tamil.pdfIn PDF document text
    • https://cdn.sqhk.co/kitijorawul/04Bgik4/zisijogawofizufofoj.pdfIn PDF document text
    • https://gawujura.weebly.com/uploads/1/3/5/3/135325150/fofazogamisex.pdfIn PDF document text
    • http://kifenefazujiz.iblogger.org/chemistry_book_for_class_12.pdfIn PDF document text
    • https://xubuvene.weebly.com/uploads/1/3/1/3/131380433/265bc5e720.pdfIn PDF document text
    • https://cdn.sqhk.co/birenejar/jtNdRhg/83572951827.pdfIn PDF document text
    • https://fosaxobe.weebly.com/uploads/1/3/4/8/134882536/9873994.pdfIn PDF document text
    • http://rte-ita.fun/survival_island_evo_2_gameplaylw8zy.pdfIn PDF document text
    • https://godobinoka.weebly.com/uploads/1/3/0/8/130815080/2bc6f3.pdfIn PDF document text
    • https://zajinepimasi.weebly.com/uploads/1/3/2/8/132815118/fe01dc21b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sumojoripira.rf.gd/tudufefisivakawadanat.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_off000104bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104BF 5288 bytes
SHA-256: 60ff6d90f39cd75b0a5c53ae0e531cc101cc664cfdf9adc34fbe5531465393b3
font_01_sfnt_off000116aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116AA 15636 bytes
SHA-256: 5357717ae46fb328b27318e034ac28783f0a079f9eb61c5d48abdd4db1c186ad

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