Malicious PDF — malware analysis report

Static analysis result for SHA-256 521c9e196f8330d1…

MALICIOUS

PDF

80.0 KB Created: 2021-03-28 02:46:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 59eb96cc5f3dd1bc58c58746b2e6ad5f SHA-1: a578e15b4b651b5b28fae19ada6e02f064b20589 SHA-256: 521c9e196f8330d1d750b6a682bc7015a23c323710c59ed903629fc573e236c4
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://jumiwimov.ru/123?utm_term=anime+berserk+1997+sub+indo PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369166/normal_600be7df7873d.pdfIn PDF document text
    • https://cdn.sqhk.co/fuvebopeweb/DfgiaJi/earn_to_die_mod_apk_for_android.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427820/normal_604a8ae822fe7.pdfIn PDF document text
    • http://lnstagaram-verifiedbadges-from.com/seriwimepolazoup5wl.pdfIn PDF document text
    • https://cdn.sqhk.co/lolajelor/tibhhXB/did_it_again_lyrics_lil_tecca_clean.pdfIn PDF document text
    • http://calipshatngaccs1.xyz/power_circle_diagram_of_transmission_line4l5cc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410194/normal_60585c7da578f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466676/normal_602a82c38264e.pdfIn PDF document text
    • http://hh666o.site/80689539935fxnm8.pdfIn PDF document text
    • http://cafe-cok.ru/learn_more_python_the_hard_way_reviewddh4p.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451018/normal_5ff5e8f9e2b08.pdfIn PDF document text
    • https://cdn.sqhk.co/zamupefa/fjhzgjg/44469909064.pdfIn PDF document text
    • http://xivobivivupe.mygamesonline.org/12442203427.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491945/normal_5ffda9ea99687.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476126/normal_60450d53be7e2.pdfIn PDF document text
    • http://demask.fun/mufivd03m0.pdfIn PDF document text
    • https://cdn.sqhk.co/numanazolov/Cjjiy3h/european_golden_boot_standings_2018-_19.pdfIn PDF document text
    • https://cdn.sqhk.co/gugivusofed/Va05fOj/how_to_remove_iron_on_girl_scout_patches.pdfIn PDF document text
    • http://bugiwuxad.medianewsonline.com/complete_key_teacher_s_book.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://42e65457-ec34-4553-8979-78b6e302f774.filesusr.com/ugd/f1976d_b52d347512824bc68bdc254b16a9b06d.pdf?index=trueIn PDF document text
    • https://37e79482-e567-4eff-b449-6ea9b90d4679.filesusr.com/ugd/cff0cd_c1768a34e29d43fa98b91ee207e66f4a.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE4 4760 bytes
SHA-256: 582319443922d96033cff1f2e245df32ff3739fab3f3c76ea9ee73e31fd380bd
font_01_sfnt_off0000f09c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF09C 5208 bytes
SHA-256: c12af3a6d3102772ef14e40e0fee7b5484df8acf26f29dd168216a989602b4cc
font_02_sfnt_off0001023e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1023E 1800 bytes
SHA-256: a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620
font_03_sfnt_off00010acb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ACB 10980 bytes
SHA-256: 6d7b55ce1ad75156c0b1f3fe97cc614c9752dd6f7b1ebe821d00a9574f4faf7f