Malicious PDF — malware analysis report

Static analysis result for SHA-256 84e99191bd6619b9…

MALICIOUS

PDF

76.9 KB Created: 2021-02-28 16:41:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 7187895790b1e19ace562ece40917a44 SHA-1: 4ae02501867cd7f6ec03ec7df2fd2e96b2888048 SHA-256: 84e99191bd6619b9f9f6eacad593b1fe717d37b0291f9df8fcdfe6e63b75b536
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. ClamAV and ML classifiers identified this as malicious, specifically a phishing trojan. The embedded URLs likely serve to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://nipisod.ru/123?utm_term=how+long+does+powerbeats+3+battery+last PDF link annotation
    • https://zokefipevi.weebly.com/uploads/1/3/4/3/134311683/9470427.pdfIn PDF document text
    • https://cdn.sqhk.co/muzolorakow/gtijO1d/48421884309.pdfIn PDF document text
    • https://cdn.sqhk.co/jifedibodo/0YG7a40/planetside_2_shattered_warpgate_review.pdfIn PDF document text
    • https://dokebama.weebly.com/uploads/1/3/2/6/132681336/zurileromedub.pdfIn PDF document text
    • http://autobuff.xyz/3607823742kwx1p.pdfIn PDF document text
    • https://maxazokal.weebly.com/uploads/1/3/1/6/131606281/natoku.pdfIn PDF document text
    • http://tonagruz.ru/mini_14_10_round_magazine_stainless1vqqv.pdfIn PDF document text
    • https://jamekefexufi.weebly.com/uploads/1/3/4/8/134866820/dupujunexufaloz.pdfIn PDF document text
    • https://meliwuka.weebly.com/uploads/1/3/2/7/132740471/tuparudumaza_wuxusateri_vesajibas_lefoletokabap.pdfIn PDF document text
    • http://mmamba.ru/affair_new_punjabi_song_ringtoneju1je.pdfIn PDF document text
    • https://cdn.sqhk.co/popuzanuguw/UCicNif/sazowamoxanixemaf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408340/normal_5fc7fbf4b3c4f.pdfIn PDF document text
    • https://nimijakis.weebly.com/uploads/1/3/4/5/134577625/boxekuzomexagogel.pdfIn PDF document text
    • https://wigikeketiru.weebly.com/uploads/1/3/1/4/131406435/rolagofet.pdfIn PDF document text
    • http://good-production17.site/tesizafimiroboxibemikop55i53.pdfIn PDF document text
    • https://wigimosasalak.weebly.com/uploads/1/3/2/8/132814057/wezidevofud.pdfIn PDF document text
    • https://cdn.sqhk.co/ruperodu/dgdGicF/new_romance_of_the_three_kingdoms_guide.pdfIn PDF document text
    • https://vazemewezasal.weebly.com/uploads/1/3/0/7/130775722/luzomawegigirure.pdfIn PDF document text
    • https://cdn.sqhk.co/buzomesil/gchikje/signs_popcap_alchemy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380857/normal_6034fe6128f83.pdfIn PDF document text
    • https://vogovolakufa.weebly.com/uploads/1/3/4/8/134874318/bofaziwame-merabobidafak-tozene.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000ee12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE12 5584 bytes
SHA-256: 099bba0720d5d281c7a9f6106962b1138cf3ba50557061af3e60acb955e76af0
font_01_sfnt_off00010134.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10134 10868 bytes
SHA-256: f358eec567f0621d8a1f83e24aa76161848c7f0179737ade92e6b95d08c1ee1a