Malicious PDF — malware analysis report

Static analysis result for SHA-256 99257eb60e43cb3f…

MALICIOUS

PDF

80.6 KB Created: 2021-02-28 14:40:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: eac79663574d97ef50f7add1c183ee11 SHA-1: ed65882550113e95d2131f28e8b66254162ee38c SHA-256: 99257eb60e43cb3f9ad81cae6806cfa8b9878d36a689177e2cbdce724092e79d
126 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs, with one specifically pointing to a suspicious domain that appears to be part of a link farm designed to redirect users. The document body, though heavily obfuscated, contains text related to a sales listing, suggesting a lure for phishing or malware delivery.

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
  • 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://golowaki.ru/123?utm_term=used+bosch+4000+table+saw+for+sale PDF link annotation
    • http://kuzojud.66ghz.com/bumusumimurilibi.pdfIn PDF document text
    • http://bataxabinon.22web.org/79360411180.pdfIn PDF document text
    • http://guwizerawefoke.iblogger.org/maze_runner_film_netflix.pdfIn PDF document text
    • https://cdn.sqhk.co/mutexeze/qYge8jf/slice_shapes_photoshop.pdfIn PDF document text
    • https://cdn.sqhk.co/moromasi/ilIgfja/monster_girl_maker_picrew.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kimogule.epizy.com/blast_pro_series_1v1_map.pdfIn PDF document text
    • http://telatojewoka.epizy.com/67753048117.pdfIn PDF document text
    • http://pijopatamotawu.epizy.com/fudunajimakuno.pdfIn PDF document text
    • https://s3.amazonaws.com/gafedupeba/farabanu.pdfIn PDF document text
    • http://tinipukax.epizy.com/fipedivizexuliridefinodi.pdfIn PDF document text
    • http://nudenagazosizav.epizy.com/81322337166.pdfIn PDF document text
    • http://mokisomalew.rf.gd/what_is_the_largest_capacity_french_door_refrigerator.pdfIn PDF document text
    • http://pobipegosaba.epizy.com/smoke_water_logo_intro_after_effect_template.pdfIn PDF document text
    • https://s3.amazonaws.com/leributafa/encyclopedia_of_philosophy_volume_3.pdfIn PDF document text
    • http://vaxutusurinav.epizy.com/alejandro_magno_biografia.pdfIn PDF document text
    • https://s3.amazonaws.com/welanisowari/nufexetafakez.pdfIn PDF document text
    • http://silumigu.epizy.com/minecraft_java_edition_for_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/lezopobigeza/kodizixuv.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_off0000fc52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC52 5564 bytes
SHA-256: 73ad332660750589ebd1d7915a2bd61cf242b1f1b1d85c76d96d3a84df8a80ad
font_01_sfnt_off00010f50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F50 11296 bytes
SHA-256: 6389398efdb4242787efa3505d1f2d41ed9ce50a7f3beff1e5319763c6da81e1

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