Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8796a72b5977954…

MALICIOUS

PDF

75.6 KB Created: 2021-05-04 11:11:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: b9d524f80381afe609852f7d77729024 SHA-1: 74433b959b5bc45c4b3ff0dda696dcf73a8bcd67 SHA-256: f8796a72b5977954e3ae7ba6ec3bd6667c885be2a26501dbe69f2f3d91adcb22
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://midufefew.ru/strik?utm_term=how+much+do+psychologists+make+a+year+uk PDF link annotation
    • https://datugabow.weebly.com/uploads/1/3/4/7/134745554/dozofedevesusi_kupawivurezo.pdfIn PDF document text
    • https://tifimiwarefimi.weebly.com/uploads/1/3/4/8/134895051/julusoxovo.pdfIn PDF document text
    • https://lijokojojet.weebly.com/uploads/1/3/5/3/135333606/beaaa.pdfIn PDF document text
    • https://likemojinefafus.weebly.com/uploads/1/3/1/4/131406739/nusizefevutari_radoxavovego_gudaboroja.pdfIn PDF document text
    • https://serofewaz.weebly.com/uploads/1/3/1/3/131379274/60086f.pdfIn PDF document text
    • https://gosawopidelogeb.weebly.com/uploads/1/3/4/7/134714887/diwiro.pdfIn PDF document text
    • https://kagodititaf.weebly.com/uploads/1/3/4/8/134868324/3868700.pdfIn PDF document text
    • https://fapufeloku.weebly.com/uploads/1/3/1/0/131071019/guxolakuwe_pupurupo_remasaveguko.pdfIn PDF document text
    • https://vumifedesonuzik.weebly.com/uploads/1/3/4/8/134849268/kiwexonorikugit_pagaxijaf.pdfIn PDF document text
    • https://ritukananikunid.weebly.com/uploads/1/3/0/9/130969552/5342880.pdfIn PDF document text
    • https://wowemaba.weebly.com/uploads/1/3/1/3/131380083/7895214.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/votuweroxigezog/lirawitox.pdfIn PDF document text
    • http://jiguluvosasibun.epizy.com/bugaboo_cameleon_3_performance_footmuff.pdfIn PDF document text
    • http://lujijetani.epizy.com/forms_of_e_commerce.pdfIn PDF document text
    • http://romovizaxitut.epizy.com/15539981935.pdfIn PDF document text
    • https://s3.amazonaws.com/wovisak/dofenifimajagumukugifo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ded97e5c-5c18-479c-b798-4ae0cdda591b/87923990861.pdfIn PDF document text
    • https://s3.amazonaws.com/farefasejikap/how_to_learn_measure_theory.pdfIn PDF document text
    • https://s3.amazonaws.com/sefipa/78611519701.pdfIn PDF document text
    • http://vibulowivez.epizy.com/casebook_in_child_behavior_disorders.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30b2a0dd-ab9a-44de-a4d2-f0430077c8d6/binomial_probability_distribution_definition_and_example.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_off0000e6fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6FB 5704 bytes
SHA-256: 7f4218cb7093b8795138fb70e9be1b418e46e06446c775e8c6664ff0359036cb
font_01_sfnt_off0000fa50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA50 10868 bytes
SHA-256: 8927fcdf561d5ecd0ffea892b1c72a5ceb5c3f30debbca10c2e8f4022d6cc56f

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