Malicious PDF — malware analysis report

Static analysis result for SHA-256 b471eaf70338e9f8…

MALICIOUS

PDF

74.2 KB Created: 2021-04-22 08:18:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 5983c4486300d54510197082f498ce74 SHA-1: 2adcf41f2f64271fb3287984d825a933328c7216 SHA-256: b471eaf70338e9f86b2f2d054bc7793650c20167d9c3eb844717183d2944fcf4
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The document body, though heavily obfuscated, appears to be related to search terms, further supporting the link farm hypothesis. No scripts were extracted, but the presence of numerous external URLs points towards a phishing or malicious redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://seumenha.ru/strik?utm_term=how+to+find+redox+reaction PDF link annotation
    • http://kapusta.pro/64316119854l34nb.pdfIn PDF document text
    • https://bijoxopibomer.weebly.com/uploads/1/3/4/3/134325560/559775.pdfIn PDF document text
    • https://sunawakajisume.weebly.com/uploads/1/3/4/3/134324988/dizifebon.pdfIn PDF document text
    • https://xubafema.weebly.com/uploads/1/3/4/4/134447535/88a9dfbc0ce.pdfIn PDF document text
    • http://lidlid.xyz/blizzard_old_gamesl0slu.pdfIn PDF document text
    • https://lugiwitowux.weebly.com/uploads/1/3/4/6/134679166/pixunapu.pdfIn PDF document text
    • http://gavazugemopemoj.22web.org/baxowubite.pdfIn PDF document text
    • https://xojutezakiveze.weebly.com/uploads/1/3/5/3/135318362/4b426.pdfIn PDF document text
    • https://sudoxelavekif.weebly.com/uploads/1/3/5/3/135305243/2695766.pdfIn PDF document text
    • https://gulurevipad.weebly.com/uploads/1/3/5/3/135349864/danegidasop-wivumipi-filejopon-zubale.pdfIn PDF document text
    • https://jarowuvuvam.weebly.com/uploads/1/3/4/6/134614172/fe2c7.pdfIn PDF document text
    • http://itabody.space/camera_raw_filter_cs4_freen5coy.pdfIn PDF document text
    • https://tedojumutu.weebly.com/uploads/1/3/4/0/134042579/dixafe-rilewot.pdfIn PDF document text
    • http://xubaseki.iblogger.org/52392164629.pdfIn PDF document text
    • https://tafanavudijis.weebly.com/uploads/1/3/5/2/135299899/7b9c7e097938c1.pdfIn PDF document text
    • https://bomekabekoz.weebly.com/uploads/1/3/4/8/134863976/8515486.pdfIn PDF document text
    • https://warapado.weebly.com/uploads/1/3/1/4/131437563/8843468.pdfIn PDF document text
    • https://dodikajopofibu.weebly.com/uploads/1/3/4/7/134704264/2398438.pdfIn PDF document text
    • http://ruszaimclub.ru/9141844271e223i.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://giluzufuropej.epizy.com/how_to_sign_up_for_chick_fil_a_text_messages.pdfIn PDF document text
    • http://gavazawedego.epizy.com/sibuwibulaxamiviwelusabuz.pdfIn PDF document text
    • http://dileginaduke.epizy.com/vesapezulirivaz.pdfIn PDF document text
    • http://lepugip.epizy.com/tevogabinosipexo.pdfIn PDF document text
    • http://zazedosipafefu.epizy.com/tebowovirajali.pdfIn PDF document text
    • http://piwodapasolok.rf.gd/rururanoge.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_off0000e5f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F5 4924 bytes
SHA-256: 65ec96fdc50ba912dd6be9d91b5a9e8d9cc22f4cfb935a91ba6b7cd202e826e5
font_01_sfnt_off0000f6db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6DB 10564 bytes
SHA-256: 97a6488cf194e9c6c6a07b4ad2813e507b7cf4446063338e7c726e628ba77b09