Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3866e71b4333437…

MALICIOUS

PDF

85.9 KB Created: 2021-03-29 20:12:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fcc4d4da391cd05e6ba8fd7fbb7c0550 SHA-1: 2b1ce6697028e5ee8adef3b5343a55a7788320fe SHA-256: c3866e71b43334379cfd798eb21a698d543874f26f67fbebe0eb746260c9a341
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for Pdf.Phishing.Trojan. The file contains a large number of external links, suggesting it is part of a link farm designed to direct users to potentially malicious websites. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external URLs indicate a phishing or malicious content distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://zajinet.ru/strik?utm_term=cub+cadet+lt1045+transmission+drive+belt+size
    • https://cdn.sqhk.co/kufalavoxig/sRKjdDF/top_20_bollywood_songs_2019_mp3_download.pdf
    • https://cdn.sqhk.co/fovudadeweto/NifGQhg/rumilajifetopa.pdf
    • https://zovarufegurer.weebly.com/uploads/1/3/4/6/134625168/4771790.pdf
    • https://fulotetaputu.weebly.com/uploads/1/3/2/7/132740707/557e88ed.pdf
    • http://zdorovie-vashe-vse.xyz/abrg_des_marchs_financiers_201936cqq.pdf
    • https://cdn.sqhk.co/wogefosa/fNhaWKA/rebel_inc_premium_apk_mod.pdf
    • https://tagipuzato.weebly.com/uploads/1/3/0/7/130776724/wuzojoweru.pdf
    • https://fukekagike.weebly.com/uploads/1/3/4/5/134587407/tolidanub-fenulo-tapipij.pdf
    • https://bevikutemo.weebly.com/uploads/1/3/4/6/134648684/vutozu.pdf
    • https://cdn.sqhk.co/botikavanov/iOSgcie/un_sustainable_development_goals_2020.pdf
    • https://cdn.sqhk.co/fogunivugame/GjbhhGc/chennai_express_video_songs_in_tamil.pdf
    • https://cdn.sqhk.co/besogevipadi/3Lgfkja/gukonamefojede.pdf
    • https://serekarivevug.weebly.com/uploads/1/3/1/4/131407867/munuk.pdf
    • https://cdn.sqhk.co/fesakesovoka/cL5gchi/lopididelufodowilejega.pdf
    • http://italywow.pro/wii_u_error_code_103_1401tp5cc.pdf
    • http://domsale.xyz/490825502075z3f5.pdf
    • http://virona.org/pathfinder_adventure_path_listgh87y.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/sikuva/gosuwoxulagoj.pdf
    • https://s3.amazonaws.com/taturi/bluebeam_revu_ly._ir.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000100a2.bin
9a6d60e8c77e00ec703b8d22c541d42e8d4e9395f6631b6bfca0783a396c9258		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100A2 5644 bytes
font_01_sfnt_off000113cd.bin
360f134dae88db78a7191dbfcfbda11ecd6809dac21db90068e98a4b9501dd8f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x113CD 11196 bytes
font_02_sfnt_off000139f8.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x139F8 4324 bytes

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