Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a26f2940240863a…

MALICIOUS

PDF

75.0 KB Created: 2021-06-04 18:58:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b8a876f0548a4dccf414622aca7cd138 SHA-1: 3899178bd08aa005baa6a3fda3aa18def168ede4 SHA-256: 1a26f2940240863a8117b33ef91c2cb57b37dc1e3f48dacfb4f5a051ee8ab107
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical PDF_SEO_LINK_FARM rule indicating a large number of external links, and ClamAV detected it as Pdf.Phishing.Trojan. The presence of numerous external URLs, such as 'https://drafthe.ru/pbw?utm_term=how+to+get+money+on+sims+freeplay+without+cheating', suggests a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and link farm indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://drafthe.ru/pbw?utm_term=how+to+get+money+on+sims+freeplay+without+cheating
    • https://cdn-cms.f-static.net/uploads/4380694/normal_60381aa1b0427.pdf
    • https://rawitexebava.weebly.com/uploads/1/3/4/4/134487877/kosamifisotos_zudofuzavakoru.pdf
    • https://rebuxikaxaj.weebly.com/uploads/1/3/4/6/134668288/jefid.pdf
    • https://saposoralax.weebly.com/uploads/1/3/6/0/136025319/womowatez.pdf
    • https://jurizimobijagi.weebly.com/uploads/1/3/0/8/130874317/ripip_korefepevoxit_gimoxe_visikobafosimu.pdf
    • https://cdn-cms.f-static.net/uploads/4387224/normal_6018ae0649516.pdf
    • https://kumuxabe.weebly.com/uploads/1/3/4/6/134670594/fewulisini.pdf
    • https://cdn-cms.f-static.net/uploads/4454435/normal_601877031972b.pdf
    • https://wubuzafovotul.weebly.com/uploads/1/3/0/8/130814439/5535641.pdf
    • https://cdn-cms.f-static.net/uploads/4446642/normal_606734c7b704f.pdf
    • https://static.s123-cdn-static.com/uploads/4443823/normal_6001311fcd744.pdf
    • https://gutoxokotuvil.weebly.com/uploads/1/3/1/3/131380594/leveletewila.pdf
    • https://nitevugumosu.weebly.com/uploads/1/3/4/5/134526644/pigotewilagipoja.pdf
    • https://static.s123-cdn-static.com/uploads/4408879/normal_5ff01a2ee6624.pdf
    • https://jimepozuzaz.weebly.com/uploads/1/3/5/3/135350414/sitisapagowabuwajiw.pdf
    • https://static.s123-cdn-static.com/uploads/4403406/normal_5ffb407da827c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/e78bc1a8-289e-45c6-bba8-86155568a14d/98824534774.pdf
    • https://uploads.strikinglycdn.com/files/84831002-bcce-4630-a457-77bd01dd2a45/how_to_unfold_my_nordictrack_treadmill.pdf
    • https://uploads.strikinglycdn.com/files/99b88360-3d8f-430c-b886-9730e688cb12/buzebesade.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e568.bin
7b77faeacdbde7e87f4075bf6cdd7e1712748c22a5b6151c5b60b18fada92369		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE568 5584 bytes
font_01_sfnt_off0000f85e.bin
118f35eddb35d56fdc8621ad8e263307993412cef4f2034550d000ec0d6072b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF85E 11196 bytes

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