Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f89a1a8639fe977…

MALICIOUS

PDF

71.7 KB Created: 2021-05-22 03:48:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: b6fa1488d234064c2da1e9cdf7a74b19 SHA-1: 46c57289f6318e2a49c672f7290bdf09c79a1a2c SHA-256: 3f89a1a8639fe977ed9807308de0ede59db6d443643037085d4655fb31353dad
186 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, suggesting a link farm designed to distribute malicious content or phish users. The heuristic 'PDF_SEO_LINK_FARM' and the presence of numerous unknown URLs strongly indicate this malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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
  • 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://resalured.ru/strik?utm_term=solutions+advanced+3rd+edition+teacher%2527s+book+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4380530/normal_5fe75a215c468.pdfIn PDF document text
    • https://miteviwu.weebly.com/uploads/1/3/6/0/136006965/430583.pdfIn PDF document text
    • https://nokaroropufut.weebly.com/uploads/1/3/1/4/131453144/9c458.pdfIn PDF document text
    • https://pulapiselipatux.weebly.com/uploads/1/3/1/3/131378970/4579317.pdfIn PDF document text
    • https://xurekibovadava.weebly.com/uploads/1/3/0/9/130969225/6404739.pdfIn PDF document text
    • https://fovofenat.weebly.com/uploads/1/3/4/4/134489119/32817d86502.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464863/normal_602945e720b51.pdfIn PDF document text
    • https://lipofodimeduwep.weebly.com/uploads/1/3/0/8/130813747/xixadepilazul-nakiba-wamiwejabilaku.pdfIn PDF document text
    • https://bubixoduxufito.weebly.com/uploads/1/3/1/0/131070588/totipujazezekanugozi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443799/normal_5ff28200e5970.pdfIn PDF document text
    • https://terulupi.weebly.com/uploads/1/3/1/4/131406892/jezun-fikotawesivo.pdfIn PDF document text
    • https://bopiwode.weebly.com/uploads/1/3/4/3/134367631/0e68d13a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368242/normal_6051e0cff235c.pdfIn PDF document text
    • https://wubugivaruj.weebly.com/uploads/1/3/4/6/134669137/bepivewoto.pdfIn PDF document text
    • https://nezikipinafuzis.weebly.com/uploads/1/3/4/3/134316621/01c8bf43.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471941/normal_604f35558063e.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/woxojuxafopuv/o_que__forma_apriorismo.pdfIn PDF document text
    • https://s3.amazonaws.com/jazamerijekufol/how_do_i_adjust_the_water_temperature_on_my_delta_shower.pdfIn PDF document text
    • https://s3.amazonaws.com/wutezigojuxi/how_to_determine_if_an_ion_is_paramagnetic_or_diamagnetic.pdfIn PDF document text
    • https://s3.amazonaws.com/jenagubadopi/oregon_dmv_drivers_license_manual.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_off0000dab5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB5 5808 bytes
SHA-256: a1a80a481960121dbf1e4bf7de73a456edae6f3f529a58cbcd08fb4bec68817f
font_01_sfnt_off0000ee7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7D 10360 bytes
SHA-256: 30a70562e0b540a13daae01002c4e1396b637652b2f6adec01882f46ccc2ead6

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