Malicious PDF — malware analysis report

Static analysis result for SHA-256 89ba5eb0756c35ce…

MALICIOUS

PDF

84.7 KB Created: 2021-02-28 21:57:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 979e0309e1b225c757f974651a6654b1 SHA-1: 74f5654c7e47d227dafecb9923104ef0672f2a3e SHA-256: 89ba5eb0756c35ceb8f1dcf715314cb7b41c90b638184df2c64d5d3c15e96e4e
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with critical heuristics indicating it functions as a PDF link farm. It contains numerous external URLs, with one specifically noted as a target for 'asphalt apk obb offline', suggesting a lure for potentially malicious software downloads. The presence of multiple SEO-related links further supports the attack pattern of using the document to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://golowaki.ru/wix?keyword=asphalt+apk+obb+offline
    • http://gefaveje.22web.org/wutomirezet.pdf
    • https://fifikasato.weebly.com/uploads/1/3/1/4/131437502/9093092.pdf
    • http://joxesozijemago.iblogger.org/decameron_boccaccio_espaol.pdf
    • https://cdn.sqhk.co/kavejufa/jgjjvjh/gag_reflex_testing_definition.pdf
    • https://cdn.sqhk.co/pekuwalixeso/hkRAhbU/55179174445.pdf
    • https://cdn.sqhk.co/laruxibut/PQxJ3jg/losesovojilipelukaxigen.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://melaworogafema.epizy.com/diy_swing_set_plans.pdf
    • https://s3.amazonaws.com/toguvaju/thomson_reuters_journal_citation_reports.pdf
    • http://dunetenarep.epizy.com/saxotepofenokup.pdf
    • http://kedumojuri.rf.gd/swann_wifi_camera_setup.pdf
    • https://s3.amazonaws.com/sagotomagin/64142189712.pdf
    • http://nefijeniwipe.epizy.com/guideline_gout_2019.pdf
    • https://s3.amazonaws.com/dowesitobuga/the_martian_movie_download_in_hindi_hd.pdf
    • http://vizepojuduw.rf.gd/voucher_formativi_master_regione_toscana.pdf
    • https://s3.amazonaws.com/lemefofutomapox/jofajisebakite.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010fc2.bin
cd89593434cff3e944c69e81f488d1751f18f74ad1fb25f1744ca01e10baf1b3
pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC2 5088 bytes
font_01_sfnt_off0001210e.bin
ad98b0651b4826265dac114bfeef0e8a888cf203da8ee4555e8b92b62e95c44a
pdf-font-stream PDF embedded font (sfnt) at offset 0x1210E 10956 bytes