Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ee5c24beb06f865…

MALICIOUS

PDF

70.6 KB Created: 2021-06-15 10:51:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e3a2ec13b2dd8c62ac3a49242d823026 SHA-1: e25d34e1227fcc584709424af9921d143720b58e SHA-256: 6ee5c24beb06f865f141d37d39afde8e9c50e9f0cd800601f4bda348d99eec4f
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 pointing to various disposable hosting services, indicative of a link farm or phishing campaign. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were extracted, the PDF structure and embedded URLs are sufficient to infer a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://oniceh.ru/pbw?utm_term=ya+dil+kyu+toda+mp3+song+download
    • https://dubasatipin.weebly.com/uploads/1/3/4/4/134459773/b65b5.pdf
    • https://nenovalo.weebly.com/uploads/1/3/2/7/132712003/1803708.pdf
    • https://static.s123-cdn-static.com/uploads/4447278/normal_5fc5fe648692a.pdf
    • https://kunipasufit.weebly.com/uploads/1/3/0/8/130874165/d047dda423b.pdf
    • https://pevosisonudem.weebly.com/uploads/1/3/7/4/137498794/b3f6073ada88857.pdf
    • https://cdn-cms.f-static.net/uploads/4370087/normal_60bb466189455.pdf
    • https://cdn-cms.f-static.net/uploads/4496391/normal_604366583d1e9.pdf
    • https://cdn-cms.f-static.net/uploads/4504554/normal_604ba3e484c07.pdf
    • https://viwukafum.weebly.com/uploads/1/3/0/7/130738591/3927c0835b34.pdf
    • https://cdn-cms.f-static.net/uploads/4421224/normal_604e424ae1649.pdf
    • https://static.s123-cdn-static.com/uploads/4418973/normal_60053990e3a57.pdf
    • https://mowofagafuvu.weebly.com/uploads/1/3/4/5/134594922/zuvugolo.pdf
    • https://mafizawejibon.weebly.com/uploads/1/3/1/3/131383772/7555490.pdf
    • https://tovamegudisolos.weebly.com/uploads/1/3/1/4/131411857/jazawegadimebu.pdf
    • https://cdn-cms.f-static.net/uploads/4451212/normal_601dbdfb2c430.pdf
    • https://static.s123-cdn-static.com/uploads/4368955/normal_5ffb583f89aa0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://jorowad.pbworks.com/f/koloxofawodojefubikuz.pdf
    • https://uploads.strikinglycdn.com/files/96b0377d-ca9f-40b4-95d8-fafc667fcfab/5207428060.pdf
    • https://uploads.strikinglycdn.com/files/0ac42cd6-01f0-4d85-8569-6af3b9ea2d4f/what_programs_do_designers_use.pdf
    • https://uploads.strikinglycdn.com/files/740c0e82-9c6e-403a-b095-505838579255/que_es_el_liderazgo_participativo_o_democratico.pdf
    • http://lifuzopa.pbworks.com/w/file/fetch/144942993/ppsspp_games_below_100mb.pdf
    • http://fokojifidesi.pbworks.com/w/file/fetch/144505419/how_do_you_reset_an_amana_front_load_washer.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_off0000d5ac.bin
54fa3684b403ed58a5fb875ec3109384f3d030f70d9ce171930df38339ccc089		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD5AC 5564 bytes
font_01_sfnt_off0000e8b3.bin
4299baf7bc23bb91736c22b6a164828c2a85a75b2c340a8ca6f7f83d15d5621c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B3 10556 bytes

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