Malicious PDF — malware analysis report

Static analysis result for SHA-256 660a9734a7b5d386…

MALICIOUS

PDF

96.4 KB Created: 2021-03-27 11:00:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 6b98732760952f33dc92d9b037e8ca8b SHA-1: b5359c6180ab7879579500f27a5dcbc4760f5f7d SHA-256: 660a9734a7b5d3863f99425764d006373b8886b01a97d29038643473cb49419e
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for Pdf.Phishing.Trojan. The presence of a large number of external links, many pointing to disposable domains, suggests a link farm designed to distribute malicious content or conduct phishing. The primary malicious URL identified is fokemale.ru, which is likely used to host or redirect to further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://fokemale.ru/strik?utm_term=afghanistan%2527s+romeo+and+juliet+quiz+answer+key PDF link annotation
    • https://cdn.sqhk.co/nivavepe/jagjdnL/sea_monster_city_apk_mod.pdfIn PDF document text
    • https://cdn.sqhk.co/retubekam/jjifjf5/badasunaregugib.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490274/normal_5fc914f5a3959.pdfIn PDF document text
    • https://cdn.sqhk.co/tagodepa/Cm8ihgd/mapuf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471941/normal_601b578e61b48.pdfIn PDF document text
    • https://cdn.sqhk.co/dikonutudibe/biaFmie/smc_pneumatic_cylinder_specifications.pdfIn PDF document text
    • http://guxesux.22web.org/vegan_diet_plan.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365657/normal_601e3b82419d8.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/3fd0f034-0fb8-4e9c-81c1-7213ff655cf4/brother_sewing_machine_ls-2125i_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfb131dc-c6d0-4346-bc1e-d44d29b1b341/2009_harley_davidson_road_king_owners_manual.pdfIn PDF document text
    • http://ginisanekuxowo.epizy.com/tell_me_about_yourself_in_interview_answers.pdfIn PDF document text
    • https://d03ec42c-8b93-48d3-a61e-9aee396c0db4.filesusr.com/ugd/1e557c_82cbdd40358749a1a1c4bcdcafd99e71.pdf?index=trueIn PDF document text
    • http://nabukewegurizev.rf.gd/bath_uk_map.pdfIn PDF document text
    • https://33edd578-4186-4695-89f3-f56a5a23fc53.filesusr.com/ugd/f17c08_0f0cca8ba35c4d39b7a8a1832f487acb.pdf?index=trueIn PDF document text
    • http://midetimekewawa.epizy.com/catisma_18.pdfIn PDF document text
    • http://widokox.rf.gd/surfactants_in_agrochemicals.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf9e0dc4-9055-4f60-9be8-e7e5723c1430/89215858043.pdfIn PDF document text
    • https://ded05c8b-f0d8-42bc-a64b-daa0b63394ca.filesusr.com/ugd/99afdc_b5a1f6c9d024435e835201ce27aa6653.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0bc61b1f-950c-43ce-b747-2db9f1df42ea/what_is_the_weight_of_diesel_fuel_per_litre.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfb0044a-9bbe-424b-bc27-3af97ca34445/19144020210.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/264b24e2-6cf0-4f44-b98b-a561e83ca1ec/weputisejizonanolafe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e56b749f-d323-44ef-9188-5999d8daba2c/how_to_calculate_the_work_done_in_physics.pdfIn PDF document text
    • https://b304dada-1952-41b2-af44-d16a3232bb3f.filesusr.com/ugd/c19c34_8939cece86e94c4d9c9f52eb297497f2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1db902ce-998a-451e-b249-372658c557eb/31306595849.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_off00013a76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A76 5856 bytes
SHA-256: 7a27f3aee8b789e896b86134bc7379c21379956ebd7e2774871a8e15426439d2
font_01_sfnt_off00014e5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E5D 11192 bytes
SHA-256: e1fb1f516aa51bc4952c5f8eda683c8ed70d14af3547f876493482aeeb166f82

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