Malicious PDF — malware analysis report

Static analysis result for SHA-256 183f653fbd7c757f…

MALICIOUS

PDF

117.6 KB Created: 2021-02-22 06:21:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: d4e11b8a4337b54e4b18ef34762f5bbe SHA-1: 73d16fcc54cbe75f2cfe946dc827107c60a1771c SHA-256: 183f653fbd7c757ffb0e994897bd8740a769d060cae9328f1191ce4ad4f65326
156 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 of which are hosted on S3 buckets and appear to be part of a link farm. One of the primary URLs, 'https://bologen.ru/123?utm_term=what+was+the+worst+australian+bushfire', suggests a phishing or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://bologen.ru/123?utm_term=what+was+the+worst+australian+bushfire PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4393358/normal_6031d9afd061d.pdfIn PDF document text
    • http://im-marceting.site/dark_blue_denim_jacket_womens_outfito48cl.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485942/normal_6005c5a6d9e8e.pdfIn PDF document text
    • https://roxuvipiga.weebly.com/uploads/1/3/4/6/134637137/7473792.pdfIn PDF document text
    • http://biomanix.best/olympus_om-2s_review1e53c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444644/normal_5fca6cf627616.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393772/normal_5fe64fbeb436b.pdfIn PDF document text
    • https://zibakuponitek.weebly.com/uploads/1/3/5/3/135303957/c122957b2569a8.pdfIn PDF document text
    • https://bufaxivija.weebly.com/uploads/1/3/1/3/131383981/rugun-naweduwerulu.pdfIn PDF document text
    • https://livozowenenebu.weebly.com/uploads/1/3/0/8/130874097/sozuboja.pdfIn PDF document text
    • http://wonder-ita.fun/69309140124j8wbo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384851/normal_6022b216f1b31.pdfIn PDF document text
    • https://bogizironafek.weebly.com/uploads/1/3/1/4/131406395/zolixatiwiza-satubitirutuwam-nazukowemebu-dalijer.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/wonumafubij/what_book_in_the_bible_talks_about_healing.pdfIn PDF document text
    • https://s3.amazonaws.com/sowirutelevolur/minadax.pdfIn PDF document text
    • https://s3.amazonaws.com/jukezeluf/e-_annotation_guidelines_springer.pdfIn PDF document text
    • https://s3.amazonaws.com/baxekojojexusol/kirirobekitizinumo.pdfIn PDF document text
    • https://s3.amazonaws.com/bokelur/12990619115.pdfIn PDF document text
    • https://s3.amazonaws.com/wonumafubij/fallout_76_swimming_test_answers.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_off00018e2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18E2B 5100 bytes
SHA-256: 5ff9130ec285d98137c33680127f460e62fd3cd598578386f4bf2d7dc2ec5726
font_01_sfnt_off00019f95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19F95 12068 bytes
SHA-256: 3e2cf7af19c9d162a3163f9d20c1b9d80a519b6ec76749ef2e530fe707e47e82

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