Malicious PDF — malware analysis report

Static analysis result for SHA-256 a358ffd287ce56f2…

MALICIOUS

PDF

71.2 KB Created: 2021-03-25 19:46:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: c1f85cf3c1d31def67192ae01f050a5f SHA-1: d05b43d2b96f3f31c2081d621cf7b6d43341ff7c SHA-256: a358ffd287ce56f2a53dfb981ad1aa46ff38b93ffdf4909b8ad387d886357c10
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a significant number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were extracted, the presence of numerous external URLs suggests the document's primary purpose is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7003

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 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
  • 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://nipisod.ru/strik?utm_term=cuanto+mide+hobbit+bermudez PDF link annotation
    • http://sarupunojupud.sportsontheweb.net/lapoluju.pdfIn PDF document text
    • http://rozefuzapotor.iblogger.org/bar_graph_in_android_github.pdfIn PDF document text
    • https://bajewenizuku.weebly.com/uploads/1/3/4/4/134475359/3ae33f9a53.pdfIn PDF document text
    • http://mujuwowewo.22web.org/fapawunaxetun.pdfIn PDF document text
    • https://ramakizuwag.weebly.com/uploads/1/3/4/3/134321509/b106843e5bd70.pdfIn PDF document text
    • http://nakodinita.scienceontheweb.net/29016431788.pdfIn PDF document text
    • http://kedamijofulufep.mygamesonline.org/xomitenagosid.pdfIn PDF document text
    • http://mogimetekojubar.scienceontheweb.net/6609633117.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://91506351-5699-48ce-85e7-8e7d071f4e87.filesusr.com/ugd/d775a9_de0ed1a5456b41498b23298f82452426.pdf?index=trueIn PDF document text
    • http://jevabatogi.rf.gd/multiplying_decimals_by_decimals_worksheet_5th_grade.pdfIn PDF document text
    • http://dapibudajemuk.atwebpages.com/sawewipid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b947c05-c820-4e4d-92dc-37d91f4ecaf3/early_childhood_development_theorists.pdfIn PDF document text
    • http://kebanibaru.epizy.com/comptia_security_certification_guide_ian_neil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c5b24ef-2aff-4294-a9c2-9b65b17267ea/46825364940.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea37127f-044d-423d-99e8-26a40d36b05e/what_veggies_are_good_for_what.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4234165d-05d2-4b23-9ee6-4e1f89faf87a/total_gym_xl7_home_gym_reviews.pdfIn PDF document text
    • https://1adbf7dc-3554-4c68-8465-6ff6db008d0f.filesusr.com/ugd/f34823_af53914bcc7043ed894127f194ab15b8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b87a6280-6ade-47e8-a042-50ddb68d2e03/mekopunugozaposu.pdfIn PDF document text
    • https://46fb9a51-9e16-4ad8-811e-2f7ed01702f7.filesusr.com/ugd/53363c_8341aa237a324e1192fab62cc64d5ea1.pdf?index=trueIn PDF document text
    • https://35e1cc1d-5f6c-4a41-9b1b-b9ae8dddc97a.filesusr.com/ugd/351eee_927d8128f4a94043b3a687bc443291f8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3184b4a-7d96-4178-84a0-8381f10819ff/2016_ford_mustang_ecoboost_premium_convertible_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dfab5994-74e5-4106-8644-cbf25642a499/30087698119.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/020f6227-45ba-46e6-9b84-81d047e77a0e/55128820262.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4a5e870-6427-436b-81ef-044c4221b106/woods_outdoor_timer_50013_manual.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC2 4952 bytes
SHA-256: 32cf37238c1474350400904c07f5c63eb192fd56b5ac3fae798d22e749607c68

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