Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9d7b519049b2cf8…

MALICIOUS

PDF

63.3 KB Created: 2021-02-24 02:07:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 624e429e8e51a9c33daf1021c3cea007 SHA-1: 90a05894486f043072a728e631a8ca5f4806d7bd SHA-256: a9d7b519049b2cf89e721ac124f7ff64a58f822b6522e4c4c5a984e549f17b15
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with a critical heuristic firing for a PDF link farm. One of the primary links points to a known malicious redirector. The ML classifier and ClamAV also strongly indicate maliciousness, classifying it as a phishing trojan. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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 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.
  • 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://crophysi.ru/aws?utm_term=graco+trax+jogger+click+connect+stroller+manual In PDF document text
    • https://tiwebusimevadeb.weebly.com/uploads/1/3/5/3/135346158/jowinuxusovitexe.pdfIn PDF document text
    • https://cdn.sqhk.co/paleguvebo/jeMggwE/best_quotes_mod_apk.pdfIn PDF document text
    • https://rinotawobuv.weebly.com/uploads/1/3/4/7/134768279/4605339.pdfIn PDF document text
    • https://cdn.sqhk.co/kezavilageg/hvMjige/download_free_bubble_pop_games.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378843/normal_6026102c4735a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376625/normal_600dc3f5b848a.pdfIn PDF document text
    • https://gusagipo.weebly.com/uploads/1/3/4/0/134017144/bdecfa5fab83.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405907/normal_6005ab969e9ae.pdfIn PDF document text
    • https://lewixixidofuj.weebly.com/uploads/1/3/4/3/134393564/6708792.pdfIn PDF document text
    • https://pexasojurez.weebly.com/uploads/1/3/1/3/131381046/3a1a615.pdfIn PDF document text
    • https://cdn.sqhk.co/kululojilo/HsjhIha/1_24_slot_car_drag_cars_for_sale.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/mejigavukolu/zoetropic_pro_apk_free_revdl.pdfIn PDF document text
    • http://sofidusujewa.epizy.com/past_simple_tense_sentences.pdfIn PDF document text
    • http://bijamujijupife.epizy.com/23587803287.pdfIn PDF document text
    • https://s3.amazonaws.com/geraromu/63809939911.pdfIn PDF document text
    • https://s3.amazonaws.com/waduzirader/bufituzujulilapogutiwakef.pdfIn PDF document text
    • https://s3.amazonaws.com/kodipopujufipig/cch_video_facebook_trn_in_thoi.pdfIn PDF document text
    • http://vidujujesux.rf.gd/12101068589.pdfIn PDF document text
    • https://s3.amazonaws.com/jexijer/46755804820.pdfIn PDF document text
    • https://s3.amazonaws.com/muxozuvalubi/88205804044.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_off0000bc07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC07 5360 bytes
SHA-256: e8423022cbdcfc2424d1678370ed9de2bb69b55382fdd1e842f0cf2cbaf3d05b
font_01_sfnt_off0000ce36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE36 10444 bytes
SHA-256: 89c9f87fd854ddd9a37d2e082888765dd4c75d9d7915f341ccca779dc593f552

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