Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae9c95575f0e2b1b…

MALICIOUS

PDF

75.2 KB Created: 2021-03-06 10:18:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 376dc7f008148efd261728b74f84be78 SHA-1: fc05030a30e66e7e4469c52e33401ecffcb318da SHA-256: ae9c95575f0e2b1b35af01ccd382dc9b36b73cfa676cd2d05df18450fd9cca14
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains and Weebly subdomains, indicating a link farm or SEO spamming operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of techniques used to redirect users to malicious sites, potentially for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://vilenefex.ru/123?utm_term=legend+quotes+marie+lu PDF link annotation
    • http://marafonsport.site/jigejizitunobojph8is.pdfIn PDF document text
    • https://masogivuxun.weebly.com/uploads/1/3/4/8/134887982/donem-wiriziwuj-jibesetilebivok.pdfIn PDF document text
    • http://kinorio5.xyz/devesoqrp2a.pdfIn PDF document text
    • https://cdn.sqhk.co/dopebuxoz/hbKxbhg/famous_ballroom_dancing_songs.pdfIn PDF document text
    • http://design-kvartira.info/vafoxutigolavomavojaxevglu1b.pdfIn PDF document text
    • https://verakolor.weebly.com/uploads/1/3/1/3/131379730/61a195.pdfIn PDF document text
    • https://rudumareta.weebly.com/uploads/1/3/1/8/131871695/tuked_rekodezejipe_datin.pdfIn PDF document text
    • https://jefanumu.weebly.com/uploads/1/3/4/8/134889008/lenapizijiku.pdfIn PDF document text
    • http://gayerkan.com/nakomalisagag3pyv.pdfIn PDF document text
    • https://cdn.sqhk.co/jekuzedu/hjk3UIY/69132979319.pdfIn PDF document text
    • http://salonvarna.com/how_has_globalisation_affected_management_accountingsiq8x.pdfIn PDF document text
    • https://nugijokokul.weebly.com/uploads/1/3/0/9/130969158/tatunekubixisuxiwiv.pdfIn PDF document text
    • http://jakor.pro/fefopukobkb5jt.pdfIn PDF document text
    • http://medicalpracticementor.com/32389596548c2z1n.pdfIn PDF document text
    • https://cdn.sqhk.co/zewuxumaro/iiZggin/why_is_my_bunny_running_around_so_fast.pdfIn PDF document text
    • https://cdn.sqhk.co/riwutosax/igekkjf/mangalore_city_corporation_ward_names.pdfIn PDF document text
    • https://duwujesipegon.weebly.com/uploads/1/3/4/8/134883919/3956285.pdfIn PDF document text
    • https://mufobasigawovog.weebly.com/uploads/1/3/5/3/135344062/zabevijuzugo.pdfIn PDF document text
    • http://arbitestpark.xyz/85227636356pphc1.pdfIn PDF document text
    • https://panubawo.weebly.com/uploads/1/3/5/3/135337149/xekutapuzefejelu.pdfIn PDF document text
    • https://wepizowo.weebly.com/uploads/1/3/0/8/130813330/7654721.pdfIn PDF document text
    • http://sellforce.ru/android_9._0_release_date_for_nokiacmgqj.pdfIn PDF document text
    • https://cdn.sqhk.co/woleparos/j9oUJhj/nuzanadasobi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000ea1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA1F 5212 bytes
SHA-256: 55eedccd65e89d91ecf550975b0ce024b1a96b12c7787f79c3fa8028e71157a1
font_01_sfnt_off0000fbb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB9 10468 bytes
SHA-256: cb8782fa845724f78b417a96ee1508a9f34060f0c716422daab1e9f1462b8ae8