Malicious PDF — malware analysis report

Static analysis result for SHA-256 550a1779c8c102db…

MALICIOUS

PDF

79.1 KB Created: 2021-03-28 05:39:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0516697b6e90b11bf0bbd0f00409db80 SHA-1: d321485b10643173ed250ef218ca7ae76c772a61 SHA-256: 550a1779c8c102db26437393e44b27f50303a07e2022e1ab04364e41e370fc70
156 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 of which are disguised as search results for common queries, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links point towards a malicious document designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bologen.ru/wix?keyword=divinity+code+dream+dictionary+pdf
    • https://cdn.sqhk.co/dulemokel/gtckHib/66141179333.pdf
    • https://cdn-cms.f-static.net/uploads/4384048/normal_605d836470a98.pdf
    • http://gikufozufuze.22web.org/walmart_grocery_wont_let_me_add_to_existing_order.pdf
    • https://cdn.sqhk.co/tezabulaw/jbdD9mB/cut_the_cake_songs_for_wedding.pdf
    • https://xifisipur.weebly.com/uploads/1/3/1/0/131069870/sumujoraw-dokekekuzojolap.pdf
    • https://jazewaxuk.weebly.com/uploads/1/3/4/3/134357124/815973.pdf
    • https://zopokirupinurow.weebly.com/uploads/1/3/1/3/131381130/7f294152580.pdf
    • https://cdn.sqhk.co/dubikewe/ATheLjf/26715744803.pdf
    • https://cdn-cms.f-static.net/uploads/4366344/normal_604edbd8ae2c9.pdf
    • https://manabaxijex.weebly.com/uploads/1/3/4/6/134626004/5080966.pdf
    • https://cdn.sqhk.co/kisasizaro/ZCgdpuf/night_sky_events_calendar.pdf
    • https://cdn-cms.f-static.net/uploads/4368950/normal_601f562b5f44d.pdf
    • https://cdn.sqhk.co/kidimezamos/5ZzvigH/vesalitefel.pdf
    • https://jodajapiguzok.weebly.com/uploads/1/3/2/7/132710756/wiforuzinuroxelugovo.pdf
    • https://static.s123-cdn-static.com/uploads/4481423/normal_5febcfaa9de96.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/falevi/photodiode_amplifiers.pdf
    • https://s3.amazonaws.com/nuruvapozixix/how_to_cook_omaha_steak_caramel_apple_tartlet.pdf
    • http://kalilom.epizy.com/44079544692.pdf
    • https://s3.amazonaws.com/sigobija/13961415606.pdf
    • https://s3.amazonaws.com/zopenave/72574557036.pdf
    • https://s3.amazonaws.com/pirosisob/wikowapadenedejiforuv.pdf
    • https://s3.amazonaws.com/wegugus/el_dador_de_recuerdos_online_hd.pdf
    • https://s3.amazonaws.com/sazixipame/state_employees_credit_union_near_me_now.pdf
    • https://s3.amazonaws.com/jazuravazaguz/zupiropes.pdf
    • http://xasezujagabef.epizy.com/fazigipibegefixebezo.pdf
    • https://s3.amazonaws.com/gofiguj/83018599448.pdf
    • https://s3.amazonaws.com/netinuwa/fegaverigejeximoxed.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5e4.bin
772eb7662efa6d9b0c310ed616cd5184b4d5c7cbfa37a12036b3ea6af22b71de
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E4 5252 bytes
font_01_sfnt_off000107c3.bin
7dd9e22ad4374fee34b49aee5b826227f0bd54d82df67a48ae8e9c3a06053fe3
pdf-font-stream PDF embedded font (sfnt) at offset 0x107C3 11512 bytes