Malicious PDF — malware analysis report

Static analysis result for SHA-256 131cea31bffb76a1…

MALICIOUS

PDF

71.2 KB Created: 2021-03-14 23:51:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2e65b90887b54db9d169fe438a4718cf SHA-1: e6816ea872d088fa60ba57f5df772d85106dde83 SHA-256: 131cea31bffb76a15aa4abf4880d0844a2b4c8d598b9956f369e077b4d0340b7
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains a large number of external links, many of which point to suspicious domains, suggesting a link farm or SEO poisoning attack. The embedded URLs and the PDF's structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://jumiwimov.ru/wix?keyword=lesson+4+problem+solving+practice+multiply+integers+answers
    • https://cdn.sqhk.co/nulaliki/ShaagfP/zivirazadimomabe.pdf
    • https://cdn.sqhk.co/nuvurero/ajbjaja/namakuvan.pdf
    • http://fosinofabeveso.22web.org/66984531151.pdf
    • https://cdn.sqhk.co/laxefotogulo/ghJ3yji/964781335.pdf
    • https://cdn.sqhk.co/tatakakuwito/dnrjhie/zerilugiponuxet.pdf
    • https://cdn.sqhk.co/supesuvepo/ij3pCjf/hangout_holidays_rishikesh.pdf
    • https://dupomogorudo.weebly.com/uploads/1/3/4/5/134595760/mevafunev.pdf
    • https://jimilosebot.weebly.com/uploads/1/3/4/0/134096588/5c988500efdf29.pdf
    • https://cdn.sqhk.co/xolilipedeko/XU513pm/lyceum_jee_neet_learning_apps.pdf
    • https://xikaxuroloxo.weebly.com/uploads/1/3/1/4/131406092/wisatavomev_rasomogazen_zitudoguradepan.pdf
    • https://lirupije.weebly.com/uploads/1/3/1/6/131606624/golofifib_nefifipop_zorasakomanosuz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://weloridotam.epizy.com/how_to_clean_nutribullet_rubber_seal.pdf
    • https://9cf5cc10-3c2e-4e30-ae6b-73ed7beed88a.filesusr.com/ugd/5c2b46_c696d1fd5a664e84a7802616d43d33ec.pdf?index=true
    • https://4eb83289-b313-4542-b68c-79a1d4783db4.filesusr.com/ugd/f6336d_828ba3d838844aceaa1f6bd844d9b122.pdf?index=true
    • https://uploads.strikinglycdn.com/files/4269ad39-16ae-414b-86a3-5488b7383c05/weweziwir.pdf
    • https://04a9e765-cf69-4035-9b9a-998d8fb4e692.filesusr.com/ugd/8c5016_e5347c5e92bc404f96bffc44528963c5.pdf?index=true
    • https://uploads.strikinglycdn.com/files/2758c380-adbf-4d8d-a726-838e93635bc8/70561691777.pdf
    • https://uploads.strikinglycdn.com/files/9833d11a-bfc7-435b-b842-c110ec918bad/how_to_wear_a_navy_blazer_with_jeans.pdf
    • http://ramapenutizawa.epizy.com/waroduja.pdf
    • https://uploads.strikinglycdn.com/files/0c9d4ff9-e3a8-4c05-aa0f-a7874b11b2b4/bujumaxik.pdf
    • https://af0fe010-594a-4ec7-a26b-e2d78e33490d.filesusr.com/ugd/7d2910_e286b4592fbe436aa4a5729374d9162e.pdf?index=true
    • https://f904ef53-caa1-4f0f-8a97-c50675c03ece.filesusr.com/ugd/2f8cea_4978f80adffb496c98743f8e0fbd1b3a.pdf?index=true
    • http://vifidunut.epizy.com/what_is_the_definition_of_symbolic_interactionism.pdf
    • http://wuzazuj.rf.gd/cover_page_design_of_annual_report.pdf
    • 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_off0000d4c8.bin
86b41fb7327e07b99638d4b831255d8c2834c8e855ba2102006df5bfc3038d9f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C8 5676 bytes
font_01_sfnt_off0000e826.bin
a75856ac000ea563c9fa6940fc0daedcfa7167e8519c09e29ac0a2658d378fb0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE826 10768 bytes

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