Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d2444c788e1deed…

MALICIOUS

PDF

83.9 KB Created: 2021-03-02 04:19:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 9cfdcf7935a48d9308bb3129f9a36326 SHA-1: aa70b9662695249373edeb72f2610f9a97618bba SHA-256: 8d2444c788e1deedb171122841b339d0d824432ce6528977a8477f3eadf8a631
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://golowaki.ru/aws?utm_term=how+to+write+a+strong+analytical+essay PDF link annotation
    • https://kaxamutibe.weebly.com/uploads/1/3/5/3/135348628/1502816.pdfIn PDF document text
    • https://dabomisefeb.weebly.com/uploads/1/3/0/7/130775205/af6063de9a6e0.pdfIn PDF document text
    • https://cdn.sqhk.co/perigupa/fhclicL/best_jump_scare_movies_on_netflix_2019.pdfIn PDF document text
    • http://pusatokolerax.mywebcommunity.org/70616572970.pdfIn PDF document text
    • https://cdn.sqhk.co/kupujape/ahgKSSV/xitusazenabixilejapuku.pdfIn PDF document text
    • https://cdn.sqhk.co/tivanosox/Whgyjid/grocery_shopping_list_listonic_apk.pdfIn PDF document text
    • http://jewogipuwivi.medianewsonline.com/91386023930.pdfIn PDF document text
    • https://tesazosutev.weebly.com/uploads/1/3/4/7/134714215/mezupogoregepuge.pdfIn PDF document text
    • https://cdn.sqhk.co/towevefizub/QDygjXL/zoditubijoverefike.pdfIn PDF document text
    • https://cdn.sqhk.co/dovoxukeni/32ae1hb/prism_live_studio_for_pc.pdfIn PDF document text
    • https://jivudajen.weebly.com/uploads/1/3/4/4/134470456/xogelipozak-rubuzatiso-sazowanijurubun.pdfIn PDF document text
    • https://cdn.sqhk.co/wozejodes/hfiege9/jevigularuluwujerej.pdfIn PDF document text
    • http://jekefidaz.mygamesonline.org/living_in_balance_session_19.pdfIn PDF document text
    • https://surudebed.weebly.com/uploads/1/3/4/5/134513173/debetaga_sizum_lorawid_kubofofurapuvum.pdfIn PDF document text
    • https://cdn.sqhk.co/fowujizul/mwheaii/67681262613.pdfIn PDF document text
    • https://gatepeduvemixif.weebly.com/uploads/1/3/4/6/134669895/nezewozimadutomujol.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://girofili.myartsonline.com/english_grammar_corrector_app.pdfIn PDF document text
    • http://vamivesuger.epizy.com/munizenapomotaligej.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_off00010cb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB1 5124 bytes
SHA-256: aaaecb711de58dae0664c2a40a44b9386920bbdc2e548852723bf7c331ea0f3d
font_01_sfnt_off00011e41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E41 10500 bytes
SHA-256: cd508eed057857d85713b06341a28badbd6d775c65e8adecf5c12aed1a736774

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