Malicious PDF — malware analysis report

Static analysis result for SHA-256 6eeb36351d1b6816…

MALICIOUS

PDF

85.9 KB Created: 2021-05-02 03:31:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: fe2b9a6df7c46d5a005f16f3550b38ea SHA-1: dc9c26b0efbb9f5e2000785f7d35410efb972b8c SHA-256: 6eeb36351d1b6816075865e9737aaf73448dd5fd06d33f979885f68612a123f6
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is identified as malicious by multiple heuristics and a machine learning classifier, specifically flagging it as a redirector and a link farm. The PDF contains numerous embedded URLs pointing to external PDF files, many hosted on disposable domains, suggesting a tactic to manipulate search engine results or distribute malicious content. The presence of a link to known malicious redirector infrastructure further supports a malicious intent.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=tuesdays+with+morrie+summary+pdf In PDF document text
    • https://cdn.sqhk.co/waxubisolo/jjeiiyc/vamivixi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409096/normal_60541ae887cae.pdfIn PDF document text
    • https://cdn.sqhk.co/sezunofubuzi/hh9jagj/12698833635.pdfIn PDF document text
    • http://logvoz.ru/75564246497l1j5y.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484126/normal_5fd771f9af440.pdfIn PDF document text
    • https://cdn.sqhk.co/xawobovuji/icij6hh/36146708620.pdfIn PDF document text
    • http://online-bestshop.xyz/rarovafirotamigarofezvr6b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416671/normal_6052a6a2d6b4b.pdfIn PDF document text
    • https://cdn.sqhk.co/pagozixupezi/hcuyjb0/gegofetelofi.pdfIn PDF document text
    • https://cdn.sqhk.co/jeposanop/eheJidm/tie_dye_hoodie_mens_uk.pdfIn PDF document text
    • http://souve.me/protocols_used_in_tcp_ip_models3kkl.pdfIn PDF document text
    • https://cdn.sqhk.co/dugelabomaw/jdhiFDD/prime_video_android_tv_apk_4._5_17.pdfIn PDF document text
    • https://cdn.sqhk.co/perikowep/at8ihgd/rixosenuvevufekur.pdfIn PDF document text
    • http://myimperfectmomlife.com/dancing_road_colour_ball_run_play_onlinei1bfq.pdfIn PDF document text
    • http://demask.fun/what_does_soft_touch_mean_slang3i8gj.pdfIn PDF document text
    • https://cdn.sqhk.co/pufowuvikij/eheieih/44050892179.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379851/normal_606103e12a51e.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/7bbf124d-1a8b-4fab-a238-7d4b0d3f2aa0/madame_bovary_movie_2000_cast.pdfIn PDF document text
    • https://a72b158e-cead-41d6-a0b3-8518216316a4.filesusr.com/ugd/35c6e2_4aa56224bba64bf2b5ae8d4938012c91.pdf?index=trueIn PDF document text
    • https://4b3b4da4-1145-40fd-8a04-0ac29766dab0.filesusr.com/ugd/6c6203_334ce20ab67144db908756101c3f1226.pdf?index=trueIn PDF document text
    • https://995be609-08d3-41b1-a6c0-90e53670bcec.filesusr.com/ugd/9988e1_70e9245c19394e11b069f3b506d77e37.pdf?index=trueIn PDF document text
    • https://bcd7deca-fd5d-492b-a220-d373ca515bc9.filesusr.com/ugd/12f4eb_61215be7e46d4e2c8ee4b247a76e679f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4927d0c-3df1-4af6-bca8-675f136d9879/132853422.pdfIn PDF document text
    • https://b7d3a0ae-8059-487b-8826-088776693174.filesusr.com/ugd/8d23e4_0af1feb0c9b34a4b82335a16b7114884.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_off000114ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114ED 5392 bytes
SHA-256: e01bc37e3651eff4e40ad553b6709f502e90e29bba3daeabb22a533fd0fec82d
font_01_sfnt_off00012730.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12730 10600 bytes
SHA-256: da78bab6bfebcd617cfc4e034d6f5b9af09d1984a29f0cf53707742b471bf706

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