Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a2792c76e3d5789…

MALICIOUS

PDF

67.1 KB Created: 2020-12-19 14:52:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 49c12e46e63002e574019982acf5758c SHA-1: 9b704d4060e5a0331ac3582cd331fc827856c76b SHA-256: 1a2792c76e3d5789bc57c8cc4199a687acff20168f39284d4cfe082420e66d9b
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 phishing or trojan threat. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO spam operation. One of the embedded URLs, 'https://trafficel.ru/aws?utm_term=sikiru+barrister+music', is particularly suspicious and likely leads to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafficel.ru/aws?utm_term=sikiru+barrister+music PDF link annotation
    • https://nojufetabug.weebly.com/uploads/1/3/4/7/134748112/9529846.pdfIn PDF document text
    • https://kupanonul.weebly.com/uploads/1/3/4/6/134682697/40a5e5.pdfIn PDF document text
    • https://juragubiv.weebly.com/uploads/1/3/0/8/130874328/134863603f.pdfIn PDF document text
    • https://pedomolakikivo.weebly.com/uploads/1/3/4/4/134440841/dewisifuzekefebefix.pdfIn PDF document text
    • https://naketutetan.weebly.com/uploads/1/3/4/6/134660231/381b0736.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413712/normal_5fb4f642dca35.pdfIn PDF document text
    • https://zodebosamu.weebly.com/uploads/1/3/4/4/134444592/204e0301e0747.pdfIn PDF document text
    • https://pijafajabivigin.weebly.com/uploads/1/3/4/6/134635516/tuzetoxev-lufamuzumej-sedizupalomipa-sebogetu.pdfIn PDF document text
    • https://gekitudijelal.weebly.com/uploads/1/3/4/2/134265938/6155991.pdfIn PDF document text
    • https://vovikadu.weebly.com/uploads/1/3/4/5/134587732/nurolemirog.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fdc9e44ff99f865bfec2588/t/5fdcfc4eeee7313623431f24/1608318032565/cidco_lottery_result_kharghar_ews.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc553139698b02c7f3e0be9/t/5fc7a8b11d106d256bc9e077/1606920369473/best_space_survival_games_ps4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd1473d7-9d87-487a-85d9-513baed8e533/86733206813.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6f3f0c6-ebfa-4f4c-b6be-e37168541b10/ximemoporifevaxov.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_off0000c8dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8DC 5220 bytes
SHA-256: a71d919374ef3a9338c25c554861a58162b3ae1cc0b8b8548691859650a62f3f
font_01_sfnt_off0000da8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA8C 11348 bytes
SHA-256: f26181a48f526f3ca1643270f306af7955096c7e64e1bcb1857034ab8f32b6e9

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