Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6c0d1c1168e0d7c…

MALICIOUS

PDF

91.7 KB Created: 2021-03-29 00:31:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 15ff5394ccdaf013269aa15199bf1195 SHA-1: 683d5c065c8463615ae71b83456bb9b8d42dcff0 SHA-256: f6c0d1c1168e0d7cd99506ec60d03ce2a22575ffee949a5595ebeb36145977eb
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, a technique commonly used in SEO link farms to drive traffic to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it acts as a gateway to potentially harmful content hosted on external domains.

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://resalured.ru/award?keyword=iv+antibiotics+list+pdf PDF link annotation
    • https://cdn.sqhk.co/xerejijasoma/chaicsI/iot_platform_architecture.pdfIn PDF document text
    • https://cdn.sqhk.co/dedogupazib/d57BifI/kapatuloripuzujozu.pdfIn PDF document text
    • https://cdn.sqhk.co/levowexesu/fEGjd8p/gifagogavaru.pdfIn PDF document text
    • http://bristol-yalta.run/trainer_forza_horizon_4_pcjp9gu.pdfIn PDF document text
    • http://natgood.space/bdd_story_templateb37ky.pdfIn PDF document text
    • https://cdn.sqhk.co/gesokusa/xOnighh/spots_connect_cheats.pdfIn PDF document text
    • http://rewita.fun/how_to_reply_boss_thank_you_emailnwly3.pdfIn PDF document text
    • http://creamwalls.space/which_rat_had_the_fastest_baseline_metabolic_rateej10b.pdfIn PDF document text
    • https://cdn.sqhk.co/miviterul/hggcC7s/dinosaur_running_game_chrome.pdfIn PDF document text
    • http://vkrowl.com/10896649908cwaod.pdfIn PDF document text
    • http://sellamorem.com/los_atributos_de_dios_para_niost4cjf.pdfIn PDF document text
    • https://cdn.sqhk.co/zokonerozo/FhhKjbd/download_clash_of_clans_for_pc_without_emulator.pdfIn PDF document text
    • http://lnstagram-office.com/88647821867kiahd.pdfIn PDF document text
    • http://sokfresh.fun/exercicios_de_torque_e_alavancagxs7a.pdfIn PDF document text
    • https://cdn.sqhk.co/mavixuwaloz/ejdjitn/royal_princess_makeup_salon_dress_up_games_2019.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5e73d190-47a4-4ead-99bf-7e9069f06a16.filesusr.com/ugd/55cc32_bb4e2477a342457ab85a9e20f7a142d2.pdf?index=trueIn PDF document text
    • https://eb40363d-1d1f-4170-a897-f23f0f433116.filesusr.com/ugd/2a1429_319c44ba883248afbe7042641758cfa4.pdf?index=trueIn PDF document text
    • https://f3b8d348-8566-49c9-a9f8-a2c3b9e1bc8e.filesusr.com/ugd/f1c748_34dd838ce01c4ca78d063474c056165f.pdf?index=trueIn PDF document text
    • https://49f3a523-2ddb-4f17-a073-729d67a362fa.filesusr.com/ugd/18c683_46752e64a37c4b39b97675c00d8a2618.pdf?index=trueIn PDF document text
    • https://bac325b5-3710-4a60-ba01-c1ac5e8a7650.filesusr.com/ugd/c111de_b16c1516fe864312b7b22a6120fd0694.pdf?index=trueIn PDF document text
    • https://a1c9bafd-2917-4c1b-b79c-a4b44a941470.filesusr.com/ugd/f0f215_57791a5d272a41529962f3606cef226a.pdf?index=trueIn 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_off00012769.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12769 5188 bytes
SHA-256: 4e71a17046d372d719474aef5404afe83a2cfbf814c45a7d53f0287f7c8e6357
font_01_sfnt_off00013928.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13928 12144 bytes
SHA-256: 9fac50d4b12ba3c6143803fb519a522a873063ee6ae7a56914a18a6b2800a5dc