Malicious PDF — malware analysis report

Static analysis result for SHA-256 3657c69915324970…

MALICIOUS

PDF

89.1 KB Created: 2021-04-27 14:41:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 0ca8cd899d7e805cac00011dc79f6d10 SHA-1: 4efca393f805f6205fa9f39624ac0444766499c6 SHA-256: 3657c69915324970c7085d3d156b386053ebfa97966465207c1542442bd3a06a
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier, with ClamAV detecting it as a phishing trojan. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing campaign. The primary malicious URL identified is https://resalured.ru/strik?utm_term=what+happens+in+the+hidden+oracle.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • 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://resalured.ru/strik?utm_term=what+happens+in+the+hidden+oracle PDF link annotation
    • https://gopogaxewose.weebly.com/uploads/1/3/4/0/134013169/9813023.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489977/normal_600977631d04b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365624/normal_5fe49dca925df.pdfIn PDF document text
    • https://bisigategisabuv.weebly.com/uploads/1/3/4/8/134884720/7241432.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491725/normal_605b83358cc1e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469847/normal_601b18c2c0138.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489609/normal_600c1038ec25a.pdfIn PDF document text
    • https://bosizeke.weebly.com/uploads/1/3/4/5/134596703/mixakedemomod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393641/normal_5fd0d9a2423e2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413225/normal_5fd2aeb522d0d.pdfIn PDF document text
    • https://kotedeturu.weebly.com/uploads/1/3/1/6/131606402/dijegejujesuripamemo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381740/normal_5fe019d8d4c51.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481409/normal_60580fc79a590.pdfIn PDF document text
    • https://wiwojuzikog.weebly.com/uploads/1/3/6/0/136050554/wemonuwopilo.pdfIn PDF document text
    • https://pefolasonej.weebly.com/uploads/1/3/4/9/134901659/ef8ab1741c8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447251/normal_600c1f2247a66.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427820/normal_60586d2e51b84.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383703/normal_603ac0dbf2e59.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/7fec76bc-cdfc-43cd-b45a-fa2808624a9b/how_to_use_innova_5300_lat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf45f2a7-e275-4f29-aabb-a02ecb424e63/95433010026.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad9e1b55-c541-4098-b065-460a8dc6f152/ode_to_man_antigone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51531121-a238-41a6-b5a4-e3aebd7a8b43/mitakugifedevejatixosen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb0a26e3-4d8b-44fb-be05-d71db31afac4/42741661718.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000110dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110DD 4964 bytes
SHA-256: 896e9dd15561cc2de2c4984abec24cec9060ec98fa427dcf7d8a118fb219de63
font_01_sfnt_off000121b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121B3 10920 bytes
SHA-256: b5e575b35f52308e6e07623f2f670ef1d5f032f653bded7a426c507cec0cdba4
font_02_sfnt_off00014731.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14731 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2