Malicious PDF — malware analysis report

Static analysis result for SHA-256 28091ca621aa0f36…

MALICIOUS

PDF

87.3 KB Created: 2021-06-10 12:42:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: dc7d4bcaa15e489696581c35e18666e8 SHA-1: ed9632a7ea66d542d0417a70ff4212c1f17807bc SHA-256: 28091ca621aa0f3633c754c19aeb9ea42004e68cfe2562ed19a6beccb8b87469
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document functions as a link farm, directing users to numerous external URLs under the guise of providing a "Canon 70d manual instruction." The presence of multiple external links, some hosted on disposable domains, suggests an attempt to manipulate search engine results or distribute further malicious content. No scripts were extracted, but the PDF structure and embedded URLs point towards a phishing or content distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://baarspo.ru/123?utm_term=canon+70d+manual+instruction PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4373261/normal_602ffb5d54dae.pdfIn PDF document text
    • https://bowefolezoz.weebly.com/uploads/1/3/1/4/131407704/9107863.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402933/normal_6035f196001ee.pdfIn PDF document text
    • https://fafutetigav.weebly.com/uploads/1/3/0/7/130775448/jufevebisivavirabem.pdfIn PDF document text
    • https://dizegovonaziluz.weebly.com/uploads/1/3/4/8/134881707/mufimovefuriz_moxirutodexid_jotadebav.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384295/normal_6019baaf517fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481064/normal_60345b219c736.pdfIn PDF document text
    • https://kajavowonedefa.weebly.com/uploads/1/3/4/8/134858644/vuxunizidotinat.pdfIn PDF document text
    • https://zipobirin.weebly.com/uploads/1/3/5/3/135386694/dezitamer.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454163/normal_600d3f2d4951b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477615/normal_603926110e123.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476282/normal_605db685e4951.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366015/normal_601c5ef554cd5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467927/normal_60beedc9052d1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421782/normal_5fca2e3439401.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393181/normal_600a190099611.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4529149/normal_6007b4245ecdd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383704/normal_603e39b53f922.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mevuteled.pbworks.com/w/file/fetch/144618387/tobakuseduzuruperaw.pdfIn PDF document text
    • http://ridelox.pbworks.com/w/file/fetch/144778488/positivist_approach_to_research.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6246ba70-e1ac-402e-9691-23b9d07522b2/how_to_choose_automatic_watch_winder.pdfIn PDF document text
    • http://kufujibumufa.pbworks.com/w/file/fetch/145036146/math_textbook_grade_9.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/741f77a7-45ec-4373-b069-5071282faa1b/big_ideas_math_grade_6_advanced_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/305aafa3-09d5-4b0d-91ac-93bcd79f06c4/sisawigotuxubejapar.pdfIn PDF document text
    • http://jivevisubido.pbworks.com/w/file/fetch/144952509/intermediate_accounting_3rd_edition.pdfIn PDF document text
    • http://gezebal.pbworks.com/w/file/fetch/144738579/arya_2_tamil_dubbed_movie_download_hd.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_off000114cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114CF 5212 bytes
SHA-256: 5e480ef88252584eaa5afe48202b4c909db03a51ab21dfecf593c6f47632e26c
font_01_sfnt_off00012674.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12674 12376 bytes
SHA-256: 6f84af2209c26049a1fcaf2d22f420bafd474191a28ccc9270c2e1da88320295

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