Malicious PDF — malware analysis report

Static analysis result for SHA-256 dce76d90c9114bb0…

MALICIOUS

PDF

77.6 KB Created: 2021-03-10 20:51:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: fa57921052d449afa3560d9ea5be8cfb SHA-1: d529a55288474bd6ea3944bd1484504b38dd080f SHA-256: dce76d90c9114bb0f3263c15570ab22d4cd8c6f9f3c1bd0475a2bf7ee06ac9a2
186 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 large number of external links, identified as a link farm. The primary external URL, https://maypoin.ru/strik?utm_term=what+are+the+44+phonic+sounds, suggests a phishing or SEO manipulation attempt. ClamAV detection and ML classification confirm the malicious nature of the PDF, likely serving as a lure to a malicious site or further content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/strik?utm_term=what+are+the+44+phonic+sounds PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4375887/normal_5fd7bb607b6ce.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403672/normal_6001e8f24b3a4.pdfIn PDF document text
    • https://cdn.sqhk.co/sadoburola/0zBicfO/71712034183.pdfIn PDF document text
    • https://cdn.sqhk.co/bitomasijelo/Ngi2chf/doxazukobilawulo.pdfIn PDF document text
    • https://bidefajiwi.weebly.com/uploads/1/3/4/0/134096082/puvafujogusu.pdfIn PDF document text
    • http://varietystore.website/bcbs_of_az_appeal_form0aooc.pdfIn PDF document text
    • https://cdn.sqhk.co/dewufidabo/mYqTihy/best_business_games_iphone.pdfIn PDF document text
    • https://rikelakejif.weebly.com/uploads/1/3/4/8/134885243/e44d251.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467004/normal_5fcc8dfea33d7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375344/normal_600a24d086762.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454424/normal_5fdad85eeec5a.pdfIn PDF document text
    • http://topstop.site/faux_calligraphy_tutorialyztoy.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/79f3cef3-d3b3-41dc-a9ca-f4dde2f9b2f7/pobofowilumavakur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a249913-9b9f-42e9-aefe-6ae5fc4ac26b/calories_in_a_homemade_taco_salad_without_shell.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b40a1819-77aa-4bc8-b2bf-e1c6f4905dec/pefetapudixewotuxir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18168af6-fe8e-4905-815d-3a3caabd3a4d/24895228977.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/309603a0-69b0-4b00-a4de-638ff90b3b53/32991019896.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3111b6ed-6ca0-4775-b5e7-9e7e586ce6ec/activities_for_18-24_months.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/592d0a0e-3407-402c-ad44-2bed4de3a1d1/what_is_the_hardest_algebra_question_the_world.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_off0000f025.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF025 5232 bytes
SHA-256: 546623d6edcbc7ffd07513ff766f81700cbbe609d851df0a8ac5dd71c05c4539
font_01_sfnt_off000101fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101FD 11912 bytes
SHA-256: 2515cb29743f7248564ecd4d91aadddda810269f730aaceec728ea9378b6d6c5

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