Malicious PDF — malware analysis report

Static analysis result for SHA-256 453b3129a1626be8…

MALICIOUS

PDF

75.1 KB Created: 2021-03-24 13:41:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 21f396a110db5a7b0c08f219d697bb66 SHA-1: ed9fb67e75e75259d4266ea77195d80a48de11fa SHA-256: 453b3129a1626be893525da915782da38159c8a3927f6ac1b10dd3e9b47cf81f
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDFs, suggesting a link farm designed to attract traffic. The primary URL, https://dafemum.ru/strik?utm_term=made+easy+electrical+handbook+pdf+free+download, is likely part of a phishing or scam campaign. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://dafemum.ru/strik?utm_term=made+easy+electrical+handbook+pdf+free+download
    • https://jogelobob.weebly.com/uploads/1/3/5/9/135961552/mabopafala.pdf
    • http://neridofufuleteg.scienceontheweb.net/30703196809.pdf
    • http://jidapuxedepu.medianewsonline.com/15197445135.pdf
    • https://sudarotabodubig.weebly.com/uploads/1/3/1/4/131407445/614247.pdf
    • http://about-fb-support.com/18835921726vll0x.pdf
    • https://dalupapixoriwu.weebly.com/uploads/1/3/1/4/131438121/4292305.pdf
    • http://nakidki-alkantara.xyz/algebra_and_trigonometry_6th_edition_blitzertj10s.pdf
    • https://cdn.sqhk.co/miviterul/hxUijgi/limobuwulutiliwinobob.pdf
    • https://cdn.sqhk.co/nepofigiper/ihib83l/offroad_car_simulator_3.pdf
    • http://wozilimesiz.mypressonline.com/0_1_knapsack_problem_using_dynamic_programming.pdf
    • https://wavurujubatebar.weebly.com/uploads/1/3/2/6/132682053/mageku-zutatikuwewe.pdf
    • https://cdn.sqhk.co/baresupujar/iEMjbhj/corky_duck_shoot_promo_code.pdf
    • https://dowamodugepaxa.weebly.com/uploads/1/3/0/7/130739159/2215323.pdf
    • http://realnoe-obshenie.online/coffee_break_germanv30ei.pdf
    • https://cdn.sqhk.co/takularozo/eshiWBW/hallmark_drama_tv_listings.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/9c53b814-de9b-432a-a932-5294b8a1d14d/wobosawexunikuvapuxisid.pdf
    • https://uploads.strikinglycdn.com/files/6ee6a630-a02c-49ae-ae44-eed0d2bde8d5/ashrae_handbook_fundamentals_2013_si.pdf
    • https://uploads.strikinglycdn.com/files/fc63e404-2438-48f6-8f35-74a6dad8b20e/gizmo_evolution_mutation_and_selection_answer_key.pdf
    • https://uploads.strikinglycdn.com/files/d0fff73a-fef6-4f22-a27f-46689acb2465/spectrum_remote_guide_not_working.pdf
    • https://uploads.strikinglycdn.com/files/ee74297d-2f6c-4064-ba9a-c40a0b9ab59a/a_discourse_on_inequality_penguin_classics.pdf
    • https://5090c2af-253d-40c3-bfb7-942fc6db26b0.filesusr.com/ugd/0511f5_e770015e70f24b5388e3aed2eae1b77c.pdf?index=true
    • https://f3c4034a-4a94-4c47-b6c5-0445626d7bf8.filesusr.com/ugd/655f09_c8a20833152d46eb9a919c8760e4877d.pdf?index=true
    • https://5de6e22f-064f-4859-b003-4eaa502c5056.filesusr.com/ugd/2609e6_fe08329822064732824899acaeb620c2.pdf?index=true
    • https://27a83426-c768-4525-a63d-b5b732cca755.filesusr.com/ugd/28b3f7_97a631ac00dd46e3b6aad7fab1ef8e95.pdf?index=true
    • https://d992f69e-bc5b-430a-92d7-abfd66d0380b.filesusr.com/ugd/6f7357_a95264e15460488693458af2b8857368.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4de.bin
762e156513e6cdffe6bbadb41707c7e6ef360869fd1f4401e0a3039864c49ca8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4DE 5644 bytes
font_01_sfnt_off0000f82e.bin
60786a01d54934eb8b92bab36a0e4dcab43c7725a328f09b8ce293a55a8ff68d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF82E 11072 bytes

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