Malicious PDF — malware analysis report

Static analysis result for SHA-256 eba1c41f4d706fe7…

MALICIOUS

PDF

79.0 KB Created: 2021-05-29 09:54:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 343a490cb056e73adf4d5311834bd4a6 SHA-1: 0f94fc93968203cf84225489324b584bfe320c69 SHA-256: eba1c41f4d706fe72673eb27041415d5cc3b969ba50610e5572d23fc82bd5330
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://druttle.ru/strik?utm_term=drakensang+bonus+code+facebook
    • https://cdn-cms.f-static.net/uploads/4424996/normal_6044262993849.pdf
    • https://static.s123-cdn-static.com/uploads/4480756/normal_5fe142a552ef1.pdf
    • https://cdn-cms.f-static.net/uploads/4418166/normal_606aa29a2a2c2.pdf
    • https://nanuleseja.weebly.com/uploads/1/3/4/0/134012971/fekasa_xuzedojorawi_lisoxodatilutam.pdf
    • https://cdn-cms.f-static.net/uploads/4409403/normal_5fe8dd306809c.pdf
    • https://binufigelivu.weebly.com/uploads/1/3/4/7/134775083/ec9c374.pdf
    • https://cdn-cms.f-static.net/uploads/4421477/normal_606951e238a53.pdf
    • https://static.s123-cdn-static.com/uploads/4453528/normal_5ffe133fd84b4.pdf
    • https://cdn-cms.f-static.net/uploads/4417141/normal_605c3d5012c87.pdf
    • https://static.s123-cdn-static.com/uploads/4393358/normal_5fe17c907a1a0.pdf
    • https://bijazebis.weebly.com/uploads/1/3/1/3/131382141/banazizu-simoz-lijuwabokugivi.pdf
    • https://static.s123-cdn-static.com/uploads/4486550/normal_5fde61bd68b0c.pdf
    • https://cdn-cms.f-static.net/uploads/4372399/normal_605db16146322.pdf
    • https://cdn-cms.f-static.net/uploads/4476943/normal_605b83b29dddf.pdf
    • https://cdn-cms.f-static.net/uploads/4366402/normal_5fda6a9bd40f5.pdf
    • https://cdn-cms.f-static.net/uploads/4446914/normal_602baf094a90e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/7aa24188-3944-4494-9efa-914f6f94635c/how_much_does_starbucks_barista_earn.pdf
    • https://uploads.strikinglycdn.com/files/36b228a7-89ea-47b6-a1b0-b3d82e83a63b/xezin.pdf
    • https://uploads.strikinglycdn.com/files/2860bcfe-246f-4aca-be15-795a3d3e79c9/22961510731.pdf
    • https://uploads.strikinglycdn.com/files/eb517f60-ce1b-4751-bd8b-0f4ba5ff4cb6/pizuwudefopikujut.pdf
    • https://uploads.strikinglycdn.com/files/c58e264b-8389-4108-99dc-d72c11a6ce4d/football_manager_handheld_2012_ios_download.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e781.bin
c38eb966ff02dd7ba6021f2ea347d9b79c71e3792f9adeb5227a7ba17b0a5dfc
pdf-font-stream PDF embedded font (sfnt) at offset 0xE781 4060 bytes
font_01_sfnt_off0000f5c0.bin
7dd0c6921f03cee263703270d761d852f9a0ee9a11bd26d1ba8126b127a06424
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C0 5360 bytes
font_02_sfnt_off00010812.bin
baf44ee1e0f1fd9de1b4f755a27e0c41ae80b931b12a9b3f227dd85c6f79aec8
pdf-font-stream PDF embedded font (sfnt) at offset 0x10812 10616 bytes