Malicious PDF — malware analysis report

Static analysis result for SHA-256 89e57ff9b379ff43…

MALICIOUS

PDF

83.9 KB Created: 2021-05-21 07:57:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: d60ba790679f9f7b9e5ca3f031f018f7 SHA-1: 6b4ed4d8139f9313395b9d101bb21d4110fce58a SHA-256: 89e57ff9b379ff431805ec333cb3fd7823bd1cfa3311fe21a8efd79de056d33f
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable hosting services, indicative of a link farm. One critical heuristic identified a link to known malicious redirector infrastructure. ClamAV also detected this file as a phishing trojan. The presence of numerous external links suggests an attempt to direct users to malicious sites, likely for phishing or SEO manipulation purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • 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.
  • 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://crophysi.ru/strik?utm_term=paper+towns+page+count In PDF document text
    • https://fugesozuxi.weebly.com/uploads/1/3/0/7/130739141/gekevoveji.pdfIn PDF document text
    • https://mizijuwewis.weebly.com/uploads/1/3/4/3/134392366/613868.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475588/normal_601720e3b78d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368748/normal_600f02f10e053.pdfIn PDF document text
    • https://tidemipevu.weebly.com/uploads/1/3/0/7/130740592/6948747.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503197/normal_5fe95156aa525.pdfIn PDF document text
    • https://xikanunifozale.weebly.com/uploads/1/3/1/8/131860479/wuson.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387232/normal_6060fc2b0dfe3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452377/normal_606e804e30db6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419198/normal_602d563c94a6b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426955/normal_6049d85062676.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448550/normal_601f2522182a9.pdfIn PDF document text
    • https://nexakolaligu.weebly.com/uploads/1/3/1/8/131871479/749b8c2f7439.pdfIn PDF document text
    • https://xodukibefapox.weebly.com/uploads/1/3/0/8/130873769/d589b1237.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379970/normal_60152a0e96bbf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493195/normal_601e9183d4ef8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389376/normal_605212e812e47.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367947/normal_5fdef1b56d5a0.pdfIn PDF document text
    • https://jipepusubame.weebly.com/uploads/1/3/4/0/134040653/pobudarumi.pdfIn PDF document text
    • https://lasomuvexovip.weebly.com/uploads/1/3/0/8/130813571/wuxerumifugufetek.pdfIn PDF document text
    • https://bujubisagakib.weebly.com/uploads/1/3/4/3/134323903/1963105.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/kawotexulozax/how_to_apply_for_pandemic_ebt_in_alabama.pdfIn PDF document text
    • https://s3.amazonaws.com/mevuzokekenojab/gegopufivog.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwotarotavuz/arduino_hm-10_tutorial.pdfIn PDF document text
    • https://s3.amazonaws.com/sagotomagin/ncr_aloha_pos_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/wejuvono/fill_in_calendar_template_april_2019.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_off00010a0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A0F 5160 bytes
SHA-256: 8fcd4520520674a9eccfa852b805e8eebb0a8b047312c57d043b37050c51bf76
font_01_sfnt_off00011bc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC3 10812 bytes
SHA-256: 1dc8425c3be03e8dd2710d4d0aa07ac00915e0d3e36b702b5fbdd484ec7b8739

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