Malicious PDF — malware analysis report

Static analysis result for SHA-256 41b5b407318041ed…

MALICIOUS

PDF

96.0 KB Created: 2021-02-12 22:13:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: aac079252a8b33103bf12ee5592550dd SHA-1: 906a4a451ac61e88a7a311908f3a9fdb07958346 SHA-256: 41b5b407318041edea90b788eb954a2cc9674c386eb5b5b4ac618bb3119b8d7e
214 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics, including a critical alert for linking to known malicious redirector infrastructure and a high ML score. The file contains a large number of embedded URLs, forming a link farm, with the primary malicious URL being https://yafferge.ru/. The presence of these links suggests an attempt to redirect users to potentially harmful content or engage in SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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/123?utm_term=cram+felkin-ahn+model In PDF document text
    • https://nusutaligufobam.weebly.com/uploads/1/3/5/3/135393176/1979924.pdfIn PDF document text
    • https://cdn.sqhk.co/gujadozede/ejjVghL/women_s_basketball_world_cup_2020.pdfIn PDF document text
    • http://trastenmyqort.online/22564669057dotdz.pdfIn PDF document text
    • http://webmastervlad.ru/hakkarim_net_101_indir_son_versiyonmor90.pdfIn PDF document text
    • https://cdn.sqhk.co/fofodafexadu/7ghgCgi/best_drivers_in_nascar_2019.pdfIn PDF document text
    • https://rurawovupotoli.weebly.com/uploads/1/3/4/0/134017211/wasonazagu-jamiwadiv-debigapo.pdfIn PDF document text
    • http://requiredjokblog.com/2819279328973wmr.pdfIn PDF document text
    • https://saranadizalexe.weebly.com/uploads/1/3/0/9/130969301/sifuwop.pdfIn PDF document text
    • http://lighttravel-ng.com/coleman_roadtrip_classic_grill_manual4ros3.pdfIn PDF document text
    • https://cdn.sqhk.co/lotuxuduvoki/ggjjUXR/cod_recipes_healthy.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://moraruvotu.epizy.com/along_the_way_app_android.pdfIn PDF document text
    • https://s3.amazonaws.com/lososimap/age_of_empires_4_apunkagames.pdfIn PDF document text
    • https://s3.amazonaws.com/futamo/bolenisevusetikakenovovaj.pdfIn PDF document text
    • https://s3.amazonaws.com/sosupejuxofedo/jakesuko.pdfIn PDF document text
    • https://s3.amazonaws.com/mujesogi/bebe_rexha_all_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/waxapoz/quiz_answer_crossword_puzzle_clue.pdfIn PDF document text
    • https://s3.amazonaws.com/tudawufed/36753779339.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012559.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12559 4972 bytes
SHA-256: 9d9d0579182dbf06a8338bab7e396a255b8b7b51c2dbf9f29188668cbc14db93
font_01_sfnt_off0001361b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1361B 11984 bytes
SHA-256: 602b59b70b14ae1f699d5a36fa9644b66961a3d68e129ba6a44521325caa7503
font_02_sfnt_off00015e66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E66 16068 bytes
SHA-256: ddba3217f58172b9153fa2e17a6755d454371157efde6935f0723efb148e6ff1

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