Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa37b5f82bd4b161…

MALICIOUS

PDF

77.6 KB Created: 2021-03-25 10:52:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: db5b837f3ec1b144a092ca7064ce3caa SHA-1: efc46bbedebe12782ede224b71c761c364c50bfc SHA-256: fa37b5f82bd4b161d3f327fd97576b89252d90d0cb3d8fbe0b1b64483ff64617
126 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially malicious sites. The ML classifier strongly indicated maliciousness, and the presence of embedded URLs further supports this. The document's content and structure are consistent with a phishing or redirection tactic, likely intended to lead users to download further malware or engage in fraudulent activities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • 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://dafemum.ru/award?keyword=edit+pdf+files+online+free PDF link annotation
    • https://volasetabis.weebly.com/uploads/1/3/4/8/134879514/79b0605efe7.pdfIn PDF document text
    • http://eroganoficial.site/free_tetris_game_for_windows_10w7o4v.pdfIn PDF document text
    • https://vetajovowevisak.weebly.com/uploads/1/3/4/7/134715596/ee2a82f821a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408002/normal_5fe90d56a6f90.pdfIn PDF document text
    • https://rejejowurodesom.weebly.com/uploads/1/3/1/3/131398559/1520104.pdfIn PDF document text
    • https://sedapelagug.weebly.com/uploads/1/3/4/1/134109100/2747231.pdfIn PDF document text
    • https://beperupofifu.weebly.com/uploads/1/3/1/6/131636755/xifevudusozipod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402956/normal_5fd619f3a8373.pdfIn PDF document text
    • https://widowajezow.weebly.com/uploads/1/3/4/5/134584852/9760417.pdfIn PDF document text
    • http://lnstagram-help-businesss.com/new_wastickerapps_new_stickers_for_whatsapp_2019_downloadiip1f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462362/normal_604acf02aceb8.pdfIn PDF document text
    • https://mepiguresibano.weebly.com/uploads/1/3/4/3/134352921/3352562.pdfIn PDF document text
    • https://nogigeto.weebly.com/uploads/1/3/4/6/134665346/lisoti.pdfIn PDF document text
    • https://fuvapevamasazu.weebly.com/uploads/1/3/4/5/134507747/tabodepevuxuvuz.pdfIn PDF document text
    • http://defeposakabap.iblogger.org/iron_deficiency_anemia_guidelines.pdfIn PDF document text
    • http://saxefitipar.iblogger.org/ketuj.pdfIn PDF document text
    • http://hisgohar.site/zabamiwegareletisiboldl4be.pdfIn PDF document text
    • http://afracheat9.xyz/kerboodle_answers_chemistry_aqa_a_level4e3b4.pdfIn PDF document text
    • http://blockingscenery.com/65606371297ppubv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427085/normal_603bbcb5c42dc.pdfIn PDF document text
    • http://wutesokafuzirew.iblogger.org/2002_ford_explorer_sport_trac_fuse_box_diagram_under_hood.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://miledekulimikem.rf.gd/13745175588.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61c04c36-d9e5-4eaa-bc95-9f71b79a4769/48498060937.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb27ba94-e101-4055-a5e2-50c60bd1723d/how_to_assess_for_anxiety.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75645d9e-1cf6-48cf-8511-d4f9687a2d32/63053086510.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3cab1deb-494b-4795-aee3-68aae643ba59/zonolife.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f315.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF315 4784 bytes
SHA-256: f356e52489cbe8d3d745d2b017b3a7fd5daaeb8d428d2fa86a92b61e653d30c4
font_01_sfnt_off0001036b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1036B 10832 bytes
SHA-256: f5cceb04ee5308185effe0e8da3efd89fcb1590d5ace3682083d3ed205fd5db0