Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fb8aa84db996bba…

MALICIOUS

PDF

71.1 KB Created: 2021-01-21 14:52:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: cdb642948f547d9520c1a9bfa2758921 SHA-1: b2bcbd904e81a2a0f5f66bf5d15f98ea4d42bcf6 SHA-256: 0fb8aa84db996bba18c8cfddca436c350eeafe6b57a81488ea03a372fa89bda2
184 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, including a critical alert for linking to known malicious redirector infrastructure. The document body is heavily obfuscated, but the presence of numerous links to disposable domains suggests a phishing or redirection campaign. The file's structure and link farm characteristics indicate an attempt to distribute malicious content or lead users to fraudulent sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffmen.ru/123?utm_term=battle+of+chaeronea+%2528338+bc%2529 In PDF document text
    • https://puxasune.weebly.com/uploads/1/3/1/3/131379014/353665.pdfIn PDF document text
    • https://fojuxiwo.weebly.com/uploads/1/3/2/6/132695505/dozejozasak.pdfIn PDF document text
    • https://site-1168260.mozfiles.com/files/1168260/84873361979.pdfIn PDF document text
    • https://wuvotawek.weebly.com/uploads/1/3/4/8/134872633/vavega.pdfIn PDF document text
    • https://site-1173361.mozfiles.com/files/1173361/messenger_apk_june_2019.pdfIn PDF document text
    • https://worijuxadije.weebly.com/uploads/1/3/4/8/134863955/66e4a88f3.pdfIn PDF document text
    • https://cdn.sqhk.co/wevafofed/jdHiiCu/game_of_thrones_wallpaper_iphone_xs_max.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482847/normal_5ff7c95f1ec46.pdfIn PDF document text
    • https://site-1171987.mozfiles.com/files/1171987/breedenet_application_form.pdfIn PDF document text
    • https://dowawanezezezo.weebly.com/uploads/1/3/1/0/131070762/df620776e.pdfIn PDF document text
    • https://cdn.sqhk.co/mudonisogub/LiaghWg/auto_thug_block_city_mod_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456122/normal_5fe1b61b412dc.pdfIn PDF document text
    • https://mabobuloxulekev.weebly.com/uploads/1/3/4/6/134692970/4108351.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411479/normal_5fef12748b95f.pdfIn PDF document text
    • https://cdn.sqhk.co/nafolekuge/QTljaii/69456138067.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xumakomowi/triangle_congruence_lab_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/waxapoz/16995741465.pdfIn PDF document text
    • https://s3.amazonaws.com/vavale/20479949434.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_off0000dac8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC8 5492 bytes
SHA-256: 57065404a515119843d8843d233c0711e33db644757ae689a3b886750b270237
font_01_sfnt_off0000ed83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED83 9876 bytes
SHA-256: 0d51ddbc8d2757dffcca95355a45e4eefc9df43d136e91fb45cfab3feccf07fa

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