Malicious PDF — malware analysis report

Static analysis result for SHA-256 14b50d5dee84c81d…

MALICIOUS

PDF

88.1 KB Created: 2021-03-19 04:57:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 87ab7299de92f57b986d0596a8d87d1f SHA-1: 64a81ce6ebf7a914b4a555906b6c92e9d22ad0f6 SHA-256: 14b50d5dee84c81d28b64890f2f61b9677ad8d4101aaaf66865ca73e06170d96
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV flagging it as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing campaign. The document body, though heavily obfuscated, contains references to 'beps action 11 pdf' and the wkhtmltopdf application, indicating a potential lure for users to click on the embedded malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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://lozipotod.ru/award?keyword=beps+action+11+pdf PDF link annotation
    • https://cdn.sqhk.co/fekesolip/ajeKolt/retroarch_ps2_core_not_working.pdfIn PDF document text
    • https://cdn.sqhk.co/rufebumu/dwhnn2f/wopadabawabiluz.pdfIn PDF document text
    • https://walikuroxora.weebly.com/uploads/1/3/2/8/132815001/rafumovumenif.pdfIn PDF document text
    • https://karaxofuko.weebly.com/uploads/1/3/5/3/135344752/wopape_timoxinu_bejire.pdfIn PDF document text
    • https://pezumebudoko.weebly.com/uploads/1/3/4/6/134681460/nuvinorepuni.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391009/normal_5ff3cd1770b53.pdfIn PDF document text
    • https://wedabivugexum.weebly.com/uploads/1/3/0/9/130968949/furomo_bevezezopa.pdfIn PDF document text
    • http://save50.pro/833119026998ic37.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374002/normal_6023e58e3465e.pdfIn PDF document text
    • https://muluxadi.weebly.com/uploads/1/3/1/4/131453645/xexovatomuxizot.pdfIn PDF document text
    • https://cdn.sqhk.co/vetelojid/egcWTgj/rofadilirafesovaxorapoge.pdfIn PDF document text
    • https://topuwozusap.weebly.com/uploads/1/3/4/8/134869447/3994093.pdfIn PDF document text
    • http://vinnipoh.fun/racing_3d_gamesape6v.pdfIn PDF document text
    • https://fekugutupufug.weebly.com/uploads/1/3/4/8/134876907/fegupadeza.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369522/normal_6043bee92fea5.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/7d7ee0d0-cc5e-4d2f-b8f7-ddef0ea17666/html_book_for_beginners_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f2ae8b8-76f1-4d58-9595-941005e66bed/51555650800.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f77a2f98-bffa-4239-adb7-e4c7ff7b16e8/emule_kad_server_list_2020.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_off00010cc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC7 4908 bytes
SHA-256: ea70e89249c3016e665871f2633f6e56e019d16c8990d2887c684e2aaab9b8b5
font_01_sfnt_off00011d84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D84 11320 bytes
SHA-256: 390ea3d2f63320e1e6b54f641ac3a88b40e42aecce8a36c1f0b21d417f5f8493
font_02_sfnt_off00014421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14421 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2