Malicious PDF — malware analysis report

Static analysis result for SHA-256 0654321407ac4bb0…

MALICIOUS

PDF

73.6 KB Created: 2021-06-09 19:30:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: f80ccda00a24022ba43628bb023817c6 SHA-1: cfdbf801a56872e0812a9ae1764f5195aa69f692 SHA-256: 0654321407ac4bb063d81292a7e42f813c405782ca32e4a8efae060577413a01
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many pointing to disposable hosting and employing UTM parameters, indicative of a link farm designed to attract traffic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://philabc.ru/pbw?utm_term=jack+sparrow+music+mp3+download PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4380072/normal_5fe16c8fb52d2.pdfIn PDF document text
    • https://baresifesej.weebly.com/uploads/1/3/4/1/134131831/116cbb485c7ef12.pdfIn PDF document text
    • https://binazinir.weebly.com/uploads/1/3/4/1/134108718/dcda69a9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484815/normal_604495c59d6d1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/29c3c246-147e-40bb-bde7-56f4ecdc775c/kindergarten_2_download_for_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c6609dd-274c-4bb3-bf05-93ae931ae0b2/83498880940.pdfIn PDF document text
    • http://furalagaposu.pbworks.com/f/kubinufopi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c804c713-a129-4c51-aaae-4530246b9a0f/is_g_shock_a_good_brand.pdfIn PDF document text
    • http://foxobekizax.pbworks.com/w/file/fetch/144564105/how_to_turn_off_sharp_tv_without_remote.pdfIn PDF document text
    • http://vipafuwusawe.pbworks.com/f/lojemawuzezanituvegukota.pdfIn PDF document text
    • http://muxopal.pbworks.com/w/file/fetch/144443139/where_to_buy_harpers_magazine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f703cb7-d8ea-46f1-b160-a07525a4fea5/wosapikuxinegeganel.pdfIn PDF document text
    • http://refarumiba.pbworks.com/f/international_auditing_standards_issued_by_ifac.pdfIn PDF document text
    • http://pejuzor.pbworks.com/f/fl_commando_game_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2be9870c-ab9f-484e-b067-a024cd84b4fc/skinnytaste_cookbook_recipe_index.pdfIn PDF document text
    • http://sisagexal.pbworks.com/w/file/fetch/144621390/83879819356.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86d30f19-a16d-4c00-a257-ed6d81725db2/14002266014.pdfIn PDF document text
    • http://xuwajesorewo.pbworks.com/f/how_to_simplify_two_square_roots_with_variables.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c484db7d-7843-4076-91d1-27007ec6a646/dixaxozuxiwujud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3df94828-3ce4-411c-8e4a-0fb0167b2ce6/best_coc_th6_base.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1fb16309-2961-4a67-81e7-928b7286bcb3/download_emulator_gba_32_bit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c456946-6c73-41fa-aa20-c79fa6a9b05c/redenezuwavewen.pdfIn PDF document text
    • http://sufizilofab.pbworks.com/f/4.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_off0000e15c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE15C 5528 bytes
SHA-256: 7096d958abbf36a02b5fb662a8d3ca3ffed1168ca02ee897a9f2f15a02827011
font_01_sfnt_off0000f425.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF425 10876 bytes
SHA-256: d1dd4b6a8f86db7aa9cc4585423ff4de9de09a2438816c7cad9f2612a04738ae