Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bb7867beeff2949…

MALICIOUS

PDF

106.8 KB Created: 2021-03-28 09:20:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 2418a50eb9a65aeac6d8a0068ba54345 SHA-1: 21505d20c40f3edf9674569e7d809353f614dff8 SHA-256: 8bb7867beeff2949e192663bb5da1d8cdba7c0a878dd8577070e2c64e40ea99b
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one critical heuristic identifying it as a malicious redirector and another as a link farm. The primary malicious URL identified is dafemum.ru, which is likely used to host or redirect to malicious content. While no scripts were extracted, the structure and heuristics strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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
  • 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://dafemum.ru/wix?keyword=bowmaster+guide+prebigbanger In PDF document text
    • http://bigwin-1xbet.fun/roku_stick_not_connecting_to_remotec5pbw.pdfIn PDF document text
    • http://bbcua.site/7695855078lb5yx.pdfIn PDF document text
    • http://sodaapp.club/974958398712gamq.pdfIn PDF document text
    • https://cdn.sqhk.co/zimopiroxab/fFEjdia/36748634152.pdfIn PDF document text
    • https://cdn.sqhk.co/lizasizova/aiJghhi/learn_drawing_app_for_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/powirafawume/Kjb4vge/55093633985.pdfIn PDF document text
    • https://cdn.sqhk.co/petawelesup/ObLicJ8/rolling_sky_2_fate_soundtrack.pdfIn PDF document text
    • http://lnstagramverifiedsbadgeform.com/how_to_troubleshoot_an_rv_ac_unitlh5nt.pdfIn PDF document text
    • https://cdn.sqhk.co/xemugugafot/ejdhghi/safari_storme_new_model_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/batumozi/AghVfhg/jowawudi.pdfIn PDF document text
    • http://table-wait.com/why_wont_my_electric_shower_turn_onkveaa.pdfIn PDF document text
    • https://cdn.sqhk.co/nadipozow/cjaFlic/advertising_key_success_factors_of_entrepreneurs.pdfIn PDF document text
    • https://cdn.sqhk.co/lafuwexale/qwhj2z9/46662033933.pdfIn PDF document text
    • http://italia-doc.space/libro_para_leer_al_pato_donald_gratisucvov.pdfIn PDF document text
    • http://rbqjkwklnd.xyz/easy_pencil_drawing_of_flowers6xij3.pdfIn PDF document text
    • https://cdn.sqhk.co/xotosira/jgH0haF/ponexilul.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/topipovikapari/mac_os_x_10._9_5.pdfIn PDF document text
    • https://s3.amazonaws.com/xijilesuzuxo/all_shayari_video.pdfIn PDF document text
    • https://6552665f-f3ce-4070-9f47-7b493df4570a.filesusr.com/ugd/3d88c7_81ffc140110948cb9a9a1759238aaef2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/geradi/39434005932.pdfIn PDF document text
    • https://d54d55f4-8004-4613-9f19-7b96cbed0ae7.filesusr.com/ugd/ce4b32_1e23d06a636940a19fec4490c69e354e.pdf?index=trueIn PDF document text
    • https://eaae50f7-3b1c-4f1b-9b3c-e2a48377569d.filesusr.com/ugd/b96e41_906615ca9e9b484b874d25d0e5f45eaa.pdf?index=trueIn PDF document text
    • https://68fdcf0a-b1f0-4758-9edf-48d2be6d990b.filesusr.com/ugd/ac51ce_99cdd06514ad4ca0857ee4943de71fa1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tajimipojimo/vufigabukojotavelilitutak.pdfIn PDF document text
    • https://s3.amazonaws.com/fadupazageraf/chunri_jaipur_ki_audio_song.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_off000162fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x162FB 5528 bytes
SHA-256: 3b86f61d33cfd415af8ee183c4a3b10aaa5357c10b0fd9002e75140192b4c899
font_01_sfnt_off000175b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x175B4 11372 bytes
SHA-256: b25c548b12a03d7e86190a8292ea51696a999586a38098984f64b074853d8e3e

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