Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c7482beea07b78e…

MALICIOUS

PDF

91.5 KB Created: 2021-02-10 03:45:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 0efd456ca257b185bd0e06251ee77353 SHA-1: a7a193f149357d836f30edd7222b7225393557f3 SHA-256: 3c7482beea07b78e5c27425c4040dd5f758f47ec9dcfe09e1f041b3ade32cf9a
184 Risk Score

Malware Insights

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

The PDF contains embedded links, with one specifically identified as a malicious redirector pointing to 'https://yafferge.ru/wb?keyword=financial%20markets%20coursera%20answers'. The document body, though heavily obfuscated, suggests a lure related to 'financial markets coursera answers'. The presence of numerous links on disposable hosting and the ML classifier's high confidence score indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 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://yafferge.ru/wb?keyword=financial%20markets%20coursera%20answers In PDF document text
    • https://nejotadig.weebly.com/uploads/1/3/1/1/131164569/rixuzezebesexapopat.pdfIn PDF document text
    • http://nuverlites.online/55242389017cjov.pdfIn PDF document text
    • https://xoxopazivufa.weebly.com/uploads/1/3/5/3/135398299/6662557.pdfIn PDF document text
    • http://mexuzekinukogip.iblogger.org/bora_bora_song_free.pdfIn PDF document text
    • http://newser.site/fukogakipidigivawiwuktqzs6.pdfIn PDF document text
    • https://dojilosadokadog.weebly.com/uploads/1/3/4/8/134890500/wozokute.pdfIn PDF document text
    • http://trokot-shopnew.online/75410578051o9sg2.pdfIn PDF document text
    • http://palumurawisan.22web.org/58989585934.pdfIn PDF document text
    • http://xosudodobuj.iblogger.org/2018_bmw_s1000rr_service_manual.pdfIn PDF document text
    • http://cardioactiveuficiale.site/sheet_music_love_story_piano73seb.pdfIn PDF document text
    • http://white-x.fun/38109246655r98wr.pdfIn PDF document text
    • http://vovpomnim.ru/the_walking_dead_michonne_game_charactersnyvwc.pdfIn PDF document text
    • http://frankkyko.com/xatopezegunojatanazevfseo.pdfIn PDF document text
    • http://ses-sanobrabotka.ru/73556329604o6onc.pdfIn PDF document text
    • https://larulesa.weebly.com/uploads/1/3/4/7/134717423/tuvazawutiwituwux.pdfIn PDF document text
    • https://dukopovofozevi.weebly.com/uploads/1/3/5/2/135295758/wavewobazuzobezepa.pdfIn PDF document text
    • https://murexaxinafol.weebly.com/uploads/1/3/4/4/134456221/kurorosisofare.pdfIn PDF document text
    • https://wirorovikematu.weebly.com/uploads/1/3/1/0/131071137/sosenanazafeka-fefoked-ketaba.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://renepipelusibav.rf.gd/14274895223.pdfIn PDF document text
    • http://zufagubiles.epizy.com/ll_bean_flannel_bed_sheets.pdfIn PDF document text
    • http://fukekixejup.epizy.com/17978085886.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_off0001279f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1279F 5056 bytes
SHA-256: 9d067df6259c1ed0263181aa301394b78d277cf1b7aab2513e9c2fea86062094
font_01_sfnt_off000138cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138CC 11892 bytes
SHA-256: 0f05f5887b0c2d42a55700d837f49ece95a603ab22e8a051762cdf9776ffd2bc

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