Malicious PDF — malware analysis report

Static analysis result for SHA-256 f182a5de506a30ba…

MALICIOUS

PDF

74.2 KB Created: 2021-04-27 04:56:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: d40de699d25343e3dda159ebdaa903b8 SHA-1: 7740d01797a77959a17796898f8ef6150d6eec88 SHA-256: f182a5de506a30ba035a5c74c3ada45175baa90ee61543e4fbc26d84e45efbcd
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a significant number of external links, many pointing to disposable hosting, 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. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://golowaki.ru/strik?utm_term=is+apple+books+app+free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4490516/normal_601593a3db432.pdfIn PDF document text
    • https://serivuzoforin.weebly.com/uploads/1/3/4/3/134334639/2477001.pdfIn PDF document text
    • https://xekukagakodepa.weebly.com/uploads/1/3/3/9/133999272/vutaduzelo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421637/normal_5fd64c4e670a4.pdfIn PDF document text
    • https://pumagawiluzade.weebly.com/uploads/1/3/4/6/134697536/dowojaw-sugidodikige.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377679/normal_5fd27d8bee9bb.pdfIn PDF document text
    • https://norudajesopoz.weebly.com/uploads/1/3/4/3/134340776/kobemobozevuge-dolexor-lujifexa-kanizifo.pdfIn PDF document text
    • https://dinomorozowi.weebly.com/uploads/1/3/4/6/134610364/nawutotoribix-jinexewijaxozo-ruwabusa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417049/normal_5ffa049b1fa18.pdfIn PDF document text
    • http://kisikevofe.iblogger.org/answer_2_shoes_apis.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4506200/normal_6002ea0ad4f7c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tubefebu.epizy.com/bosinoxowagebumemurexa.pdfIn PDF document text
    • http://bozebefinodon.epizy.com/bised.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1cf8a90-2d47-4144-8c6d-4fc6f981271b/13251101063.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d4fda2e-a4e3-4fa1-b955-472ba61c28d8/what_are_some_applications_of_human_genetic_testing_pros_and_cons.pdfIn PDF document text
    • http://kojorelivav.rf.gd/25531254050.pdfIn PDF document text
    • http://jekotev.epizy.com/mugalonefelofubifiwomipat.pdfIn PDF document text
    • http://gejofizax.rf.gd/jakowikomomofomu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f99e963-ecc7-4525-9288-2fba9db04ca5/zogavigarajuxas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0291db9-3cef-414c-b75d-09639d9c4852/how_to_turn_on_voice_search_in_google_chrome_in_mobile.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0697eaaf-cd0a-4998-a318-82c1e45751d8/mebenedureripatukosil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/423d106c-e3d7-4bcb-8125-2b8c753592e2/nasitomixikotovodolit.pdfIn PDF document text
    • http://mupefapakag.rf.gd/alicante_city_map.pdfIn PDF document text
    • http://gekuvilis.epizy.com/5395972927.pdfIn PDF document text
    • http://pegolika.rf.gd/cvs_specialty_pharmacy_fax_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86777d58-1c35-4fe9-9c1c-a7e82b6d67d5/fiwov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0fa47d4-e3ca-4b22-8ea1-7999887dbd13/how_to_paint_in_microsoft_word_2007.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_off0000e764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE764 5036 bytes
SHA-256: 8f89fb0879cc37dd2528237144252fceb67b722ebbe2ccf8881bdd8b6deb0587
font_01_sfnt_off0000f898.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF898 10168 bytes
SHA-256: f065885a7d0b561fa10ff58aa42f7c0908a185ed2742bdc2d83b07014b1ff81d

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