Malicious PDF — malware analysis report

Static analysis result for SHA-256 68e667e42da7a8a9…

MALICIOUS

PDF

77.5 KB Created: 2021-03-13 15:35:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 24bdb99655af90baf4d686de9c65a821 SHA-1: df9c48803a3d8c909203c3a35e64eb3aad8ae6da SHA-256: 68e667e42da7a8a9c9d40a432189a4a125014165877c313cbdde2fcb7655f186
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The embedded URLs, such as 'https://midufefew.ru/award?keyword=volume+formula+worksheet+pdf', are likely part of this redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://midufefew.ru/award?keyword=volume+formula+worksheet+pdf PDF link annotation
    • http://parralax.net/marley_and_me_full_movie_online_free_no_downloadaodqh.pdfIn PDF document text
    • https://matexofetuboso.weebly.com/uploads/1/3/1/4/131453592/213832.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485942/normal_60237c8b90b4a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423154/normal_5fcc2e0672996.pdfIn PDF document text
    • http://reduslim-shopofficial.site/supoxesotavamenije9waxs.pdfIn PDF document text
    • https://bokirises.weebly.com/uploads/1/3/1/6/131607331/3683834.pdfIn PDF document text
    • https://nukoxifade.weebly.com/uploads/1/3/4/3/134332817/zetinam.pdfIn PDF document text
    • https://ralanuda.weebly.com/uploads/1/3/0/7/130775203/wusiriwitulina.pdfIn PDF document text
    • http://betmoy54.com/fujitsu_scansnap_ix500_scanner_user_manualp7rl0.pdfIn PDF document text
    • https://wilegefozuf.weebly.com/uploads/1/3/4/3/134399327/6764fec36687.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481684/normal_602245089b6ea.pdfIn PDF document text
    • https://xizidalubatud.weebly.com/uploads/1/3/4/5/134583516/9679048.pdfIn PDF document text
    • https://cdn.sqhk.co/lepowabog/9jehbir/are_early_90s_basketball_cards_worth_anything.pdfIn PDF document text
    • https://sovivagigeb.weebly.com/uploads/1/3/5/2/135296454/6542926.pdfIn PDF document text
    • https://cdn.sqhk.co/fagaxirupunu/71FQhfB/rezajebegadugutakeg.pdfIn PDF document text
    • https://zokaduxenatased.weebly.com/uploads/1/3/1/6/131637020/6490329.pdfIn PDF document text
    • https://widowajezow.weebly.com/uploads/1/3/4/5/134584852/papababeribu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374860/normal_601726735c9f0.pdfIn PDF document text
    • http://pet-guru.shop/unit_1_chemistry_for_life_metric_conversion_worksheet_answer_keyhx3rx.pdfIn PDF document text
    • http://digitalmicroteter.xyz/52551369634nix3z.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415321/normal_5fff4f8beaea6.pdfIn PDF document text
    • https://bamufikike.weebly.com/uploads/1/3/1/6/131606241/falefowi-womejedagawos-rididan-nanodobetunu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f252.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF252 5400 bytes
SHA-256: 890937a1f0ae911d27e1796ee61c6b8bf98742f2361f434e7c1e0df8d50c1fd2
font_01_sfnt_off0001049d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1049D 10444 bytes
SHA-256: 1f87861f7efb28a82bb87796bf986b57db577fce8dde81be9920a78a69c7a768