Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f65ef9410f64931…

MALICIOUS

PDF

65.0 KB Created: 2021-06-05 00:01:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 940847b3a7f8f1425d98487403d00ada SHA-1: 6ba5fb825efaee41e9318411e7f031dce197e934 SHA-256: 5f65ef9410f6493145e31537fdbb108873d78a0ef1eae619e8cdf1dc62ee1d4e
184 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm or phishing operation. The presence of a 'flash mob' lure in the document body and the numerous external links indicate an attempt to direct users to malicious websites. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9263

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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://medvor.ru/pbw?utm_term=flash+mob+united+bakers+toronto+canada PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4366011/normal_5fcc6962e42ab.pdfIn PDF document text
    • https://towutibe.weebly.com/uploads/1/3/4/0/134012467/5faeec.pdfIn PDF document text
    • https://xuzanuvu.weebly.com/uploads/1/3/7/5/137508084/kidezaxa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408335/normal_60009e9e59aff.pdfIn PDF document text
    • https://wutosalix.weebly.com/uploads/1/3/4/6/134635680/525612a736.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385421/normal_6019976914265.pdfIn PDF document text
    • https://boluzevorekov.weebly.com/uploads/1/3/1/3/131384542/b1c1e0e38215052.pdfIn PDF document text
    • https://mokaredoraxo.weebly.com/uploads/1/3/4/0/134095924/zaxeka_zegixu.pdfIn PDF document text
    • https://mamonaxerif.weebly.com/uploads/1/3/5/3/135347384/bdd0f25a6.pdfIn PDF document text
    • https://figiroxofidun.weebly.com/uploads/1/3/0/7/130740151/wagurutumodana-zazagofigulo-mivopalu.pdfIn PDF document text
    • https://supagerafigi.weebly.com/uploads/1/3/0/8/130874211/wuzikivawo.pdfIn PDF document text
    • https://zogeliwev.weebly.com/uploads/1/3/4/3/134353139/vopif_kibatanoxe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://duriwug.pbworks.com/w/file/fetch/144614022/dikafifu.pdfIn PDF document text
    • http://barumena.pbworks.com/f/21819371714.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f7193ea-332d-4122-9d7b-a2b533c780d8/27607689086.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6382e480-e739-4ab5-af2f-97758727ff93/how_to_find_relative_atomic_masses.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a927bba4-eb3b-4a79-a33d-78503e50f973/lekegu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5282af29-170c-4698-be5b-c48ad2ea7f40/megevareluni.pdfIn PDF document text
    • http://pokatufaxi.pbworks.com/w/file/fetch/144595920/21607423084.pdfIn PDF document text
    • http://kimotamiju.pbworks.com/f/bawuzibedimakopu.pdfIn PDF document text
    • http://mavujeridolu.pbworks.com/f/how_to_add_mods_american_truck_simulator.pdfIn PDF document text
    • http://polubisoxuwo.pbworks.com/w/file/fetch/144505665/tavediresod.pdfIn PDF document text
    • http://wojipag.pbworks.com/w/file/fetch/144587625/chuyn_i_vn_bn_t_sang_word_online.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0ED 5340 bytes
SHA-256: 7e6bb7655b60d9d8b836f00ef8f2f89448d916817a938a12b7ab8f12e8d27ff7

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