Malicious PDF — malware analysis report

Static analysis result for SHA-256 f51d1dbe17879480…

MALICIOUS

PDF

73.0 KB Created: 2021-05-30 11:01:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b40fb2579d5fcfc195dd0df4e70f64e0 SHA-1: d9bbf4044e298b35fc9a3843de7463c7adb11d18 SHA-256: f51d1dbe17879480cc030b9972b4fadd04e5839450d9e29f7f31de6f5ef3c9ac
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_LINK_FARM' suggests the document contains a large number of external links, likely to SEO-optimized pages, and the presence of embedded URLs points towards an attempt to redirect users to malicious sites. The document's content, though heavily obfuscated, appears to be a lure, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://crophysi.ru/123?utm_term=aqa+sociology+gcse+revision+guide
    • https://gojenegitoz.weebly.com/uploads/1/3/4/3/134387591/dogofuw.pdf
    • https://cdn-cms.f-static.net/uploads/4368487/normal_60395f29b2e83.pdf
    • https://cdn-cms.f-static.net/uploads/4496005/normal_6057b0d112adf.pdf
    • https://cdn-cms.f-static.net/uploads/4458389/normal_5fe8d7137ff78.pdf
    • https://cdn-cms.f-static.net/uploads/4492245/normal_6057c3a810351.pdf
    • https://cdn-cms.f-static.net/uploads/4403556/normal_605611bd7f9a5.pdf
    • https://nagiwudulowep.weebly.com/uploads/1/3/0/7/130775657/2425321.pdf
    • https://tadiselugel.weebly.com/uploads/1/3/4/5/134589133/zodutasaxuw-xegabegixaza.pdf
    • https://venubitolaxi.weebly.com/uploads/1/3/4/3/134372432/2b4cfca2fb569.pdf
    • https://nugelemuv.weebly.com/uploads/1/3/0/7/130739301/sisoganodu-gedil-dogezuxogusuka.pdf
    • https://cdn-cms.f-static.net/uploads/4409239/normal_600e8b36611ad.pdf
    • https://dixufewopirar.weebly.com/uploads/1/3/0/7/130775961/899071a3b7ab.pdf
    • https://dumasibomis.weebly.com/uploads/1/3/4/6/134642495/wedavobu-wenere-nakijuzujez-tutus.pdf
    • https://cdn-cms.f-static.net/uploads/4447641/normal_6061d93b70d14.pdf
    • https://static.s123-cdn-static.com/uploads/4428035/normal_6000ad7e21666.pdf
    • https://cdn-cms.f-static.net/uploads/4491153/normal_602b5fe687081.pdf
    • https://static.s123-cdn-static.com/uploads/4503584/normal_5fe19d3737fc9.pdf
    • https://wodedofa.weebly.com/uploads/1/3/4/3/134320626/vaxivofofiteve.pdf
    • https://static.s123-cdn-static-d.com/uploads/4405950/normal_60b297a90ad0f.pdf
    • https://static.s123-cdn-static.com/uploads/4475580/normal_60017efa1f675.pdf
    • https://cdn-cms.f-static.net/uploads/4384828/normal_6057bf4b36cbb.pdf
    • https://cdn-cms.f-static.net/uploads/4414176/normal_601bc6c0c3c38.pdf
    • https://cdn-cms.f-static.net/uploads/4366642/normal_604a7e933932d.pdf
    • https://cdn-cms.f-static.net/uploads/4490129/normal_6049f1b59bf71.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off0000dd92.bin
18b14045932f163c0df537eeb0628b5036bc2b018d988b7046a0a73bef1061a8
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD92 5384 bytes
font_01_sfnt_off0000eff8.bin
ad35b5672af381ea47fee5b230f0517d801bbf6743a72a663137967b3584d795
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF8 11288 bytes