Malicious PDF — malware analysis report

Static analysis result for SHA-256 456697b1e293f183…

MALICIOUS

PDF

92.3 KB Created: 2021-03-25 10:20:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 9d0192ed1471858649a20dd0da5c0302 SHA-1: c434cc21ccd6d1f657f36da62d944eef95976f87 SHA-256: 456697b1e293f1833d378ace33a1e93c6c6a4b39d59956cfdd347797709e0944
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm, containing a large number of external URIs. The ML classifier and ClamAV also identified it as malicious, with ClamAV specifically labeling it as Pdf.Phishing.Trojan. The document's structure and embedded links suggest an attempt to redirect users to potentially malicious or SEO-manipulated content, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/award?keyword=adjacent+channel+interference+pdf PDF link annotation
    • https://zegilaritapedu.weebly.com/uploads/1/3/1/4/131438092/zajonotaraja_lofixasarujom.pdfIn PDF document text
    • http://muwilagugo.iblogger.org/92451756994.pdfIn PDF document text
    • https://makonajarozov.weebly.com/uploads/1/3/4/3/134341931/togojevapiru.pdfIn PDF document text
    • https://megojame.weebly.com/uploads/1/3/5/9/135992505/wifiwosaj_befafobewin_gurewokakip_dukomumameler.pdfIn PDF document text
    • https://pafetuvuwube.weebly.com/uploads/1/3/4/3/134321561/lamen.pdfIn PDF document text
    • https://fibetenozogu.weebly.com/uploads/1/3/0/8/130813768/jizizopoxu_lofumogumalewi.pdfIn PDF document text
    • https://lepatoketi.weebly.com/uploads/1/3/4/7/134732542/wepipufa-lizujedusule-wogaka.pdfIn PDF document text
    • https://lasuzolus.weebly.com/uploads/1/3/5/3/135315371/lutijovexinu_zuwop_dibugila_rijolobamegetat.pdfIn PDF document text
    • https://bigakajufejala.weebly.com/uploads/1/3/4/2/134265656/b466c21b2c68368.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://mafivofadol.epizy.com/51992147640.pdfIn PDF document text
    • http://roxadib.epizy.com/pmd_clean_reviews.pdfIn PDF document text
    • https://8fa10226-37c2-454d-bd65-ced70ecbf0c4.filesusr.com/ugd/c34aa9_f195fe0767754a08877dc13f8e978945.pdf?index=trueIn PDF document text
    • http://logabijizuz.epizy.com/the_old_fashioned_way_book.pdfIn PDF document text
    • http://vegexiwijije.rf.gd/58886721384.pdfIn PDF document text
    • https://f1c0478e-57b3-422a-b8eb-433964b677d2.filesusr.com/ugd/16c17d_18a09cb0432d4487b4857c57394cc117.pdf?index=trueIn PDF document text
    • http://rumajajoneder.rf.gd/hp_photosmart_c4580.pdfIn PDF document text
    • http://jikelofov.rf.gd/what_is_the_formula_for_power_output.pdfIn PDF document text
    • https://0b7b936c-93ac-4a60-9644-6ba220b934cc.filesusr.com/ugd/b4bf80_b8c7a82050ef41a1b5f9a0ebfffa8398.pdf?index=trueIn 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001096e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1096E 4808 bytes
SHA-256: db1b4fd0f753333c2f0c94f8b99bc6faba502e2d41cdfe2749a94ee049b21b94
font_01_sfnt_off000119b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119B3 11348 bytes
SHA-256: 519f1629f747ecb16616c3ebaf2d47b7743cf0936fbfd63fd34d24da11e5f808
font_02_sfnt_off000140c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140C6 16060 bytes
SHA-256: 4ef9506ee11a349461550e6b437e3786686b598308a87786035880d16624999d
font_03_sfnt_off0001555e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1555E 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3