Malicious PDF — malware analysis report

Static analysis result for SHA-256 72e8da89a22dd5a9…

MALICIOUS

PDF

77.6 KB Created: 2021-05-11 15:11:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e6b659057aa4e66ee343944faa9aaae8 SHA-1: 7f076893a4d6e2da3228de1d254c7e8394a07855 SHA-256: 72e8da89a22dd5a9bac8ecf0fe8ab5791376c5a031eea9652f02ca37c0460f89
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing campaign. The ML classifier and ClamAV detection strongly indicate maliciousness. The embedded URLs and the document body's title suggest a lure to external content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • 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://seumenha.ru/strik?utm_term=how+to+win+an+argument+when+you+are+right
    • http://zagafesujed.iblogger.org/39408160275.pdf
    • https://cdn-cms.f-static.net/uploads/4389821/normal_5fd85fd1a36cc.pdf
    • https://rogexufinijofe.weebly.com/uploads/1/3/1/1/131164439/mutaw-fuzasimowum-gutomi-simemedi.pdf
    • https://cdn-cms.f-static.net/uploads/4417980/normal_5fe83d9a3fc5a.pdf
    • https://wimazuwog.weebly.com/uploads/1/3/0/7/130740080/73f843149.pdf
    • https://cdn-cms.f-static.net/uploads/4381085/normal_6018eda7c8812.pdf
    • https://kikosezuzo.weebly.com/uploads/1/3/1/3/131378972/4ccb8bd1e8fdaca.pdf
    • https://cdn-cms.f-static.net/uploads/4371809/normal_5fdb3d670edde.pdf
    • https://static.s123-cdn-static.com/uploads/4370072/normal_6002665f66567.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/59f4eee7-ad54-436b-9e72-45b67d3b1a77/99433355316.pdf
    • https://c5c1e25b-3ca9-4f8f-aecb-0ee3b29cb37b.filesusr.com/ugd/f4fe7b_b29b27030875435991475c645f8badb2.pdf?index=true
    • https://989244f3-426d-4557-b4f1-0018dac9047c.filesusr.com/ugd/57c819_d0a6b436a2584c3a8963916d897841ac.pdf?index=true
    • http://domusas.rf.gd/zajijavufigigized.pdf
    • http://setebuvoterir.rf.gd/6575268785.pdf
    • http://tizaxamadifar.epizy.com/68149297387.pdf
    • https://383fd46b-cc41-47b7-9379-19c19d7bb1fe.filesusr.com/ugd/81c43a_0e2f719aa01a4b89be833a0cd5edf988.pdf?index=true
    • https://a26b494c-4f54-4b9d-aaa3-e02d462d315a.filesusr.com/ugd/c6268f_c788ebc5b5c445b48ec4d405b59c7bb3.pdf?index=true
    • http://pepasikifiwen.epizy.com/pukigikimax.pdf
    • https://38e81cab-313f-462b-917d-d566bf782aa4.filesusr.com/ugd/36aba1_ebc0110d4c8843d6acd1f21fd9256c01.pdf?index=true
    • https://uploads.strikinglycdn.com/files/4f89a6c8-4f9c-4094-8ac6-06f46b28e9b4/161802711.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_off0000f266.bin
6a547cbd77e0254b14da9daceefd6d06c051b5ba0f32019735c6459f4d2d09d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF266 5044 bytes
font_01_sfnt_off0001037c.bin
5e978b993be328257b97597a487a478f93f845b304e445fa89bff7add47827e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1037C 10824 bytes

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