Malicious PDF — malware analysis report

Static analysis result for SHA-256 f468eeb7a3c3538b…

MALICIOUS

PDF

78.4 KB Created: 2021-03-22 22:27:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 210c9b5764b851fc553d27fecbba0fcb SHA-1: 79fbd5f02c8411ace912f54e066ce49adc9e8f85 SHA-256: f468eeb7a3c3538b586f85d172d1f028c40f13e09337b457cdf592718714419e
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were extracted, the embedded URLs are the primary indicators of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://leonvi.ru/123?utm_term=attestazione+di+conformit%25C3%25A0+avvocato+domiciliatario
    • https://jebapawobukil.weebly.com/uploads/1/3/4/5/134521284/jifinisu_pawodutine_dopawitunelilo_wikojo.pdf
    • https://fupemotajupatis.weebly.com/uploads/1/3/4/7/134718556/nigunif-jiwefo.pdf
    • https://cdn-cms.f-static.net/uploads/4446761/normal_5fe949df9727a.pdf
    • http://somirolixikaf.iblogger.org/behaviorism_learning_theory.pdf
    • https://cdn-cms.f-static.net/uploads/4485578/normal_6017f72174efe.pdf
    • https://xixefofitajeres.weebly.com/uploads/1/3/3/9/133999179/reviwo.pdf
    • https://bugituwixumanuz.weebly.com/uploads/1/3/4/7/134722584/mepojobejuxavugim.pdf
    • https://static.s123-cdn-static.com/uploads/4426954/normal_5fe4045f2752b.pdf
    • https://pidumiwululixew.weebly.com/uploads/1/3/4/0/134095913/1b9e1d1f2cc6bf5.pdf
    • https://maxamiboxu.weebly.com/uploads/1/3/1/6/131607029/7837045.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://6c036dbd-b327-4678-b778-de8a2ee7bb50.filesusr.com/ugd/ed64d2_3f05b145373740a189e2212c1bea23cd.pdf?index=true
    • https://uploads.strikinglycdn.com/files/2c428022-fa22-45ce-8e02-5dc00fafd2c8/siemens_hearing_aid_dealers_in_mumbai.pdf
    • https://b7d3a0ae-8059-487b-8826-088776693174.filesusr.com/ugd/8d23e4_a7b051bf58da4c73a62185d198f23f6a.pdf?index=true
    • https://5e024257-ca51-40df-b6b5-a3104c7b7124.filesusr.com/ugd/97368a_07a564582944461581d8e296bdf8aeca.pdf?index=true
    • http://mirenefomex.rf.gd/monelabugebos.pdf
    • http://zanuvagus.epizy.com/odd_thomas_cazador_de_fantasmas_online_castellano_hd.pdf
    • https://uploads.strikinglycdn.com/files/4ee02dc5-59fa-4003-a71b-07b791a27644/how_do_you_calculate_cash_dividends.pdf
    • https://0d555108-1732-4721-8d72-76d747b2053a.filesusr.com/ugd/1b0481_e4eddcc1977e4e529e16a4bf0b55e136.pdf?index=true
    • https://70fbc5f3-53e4-4072-9ff7-a5862d19847b.filesusr.com/ugd/bb3bf9_d7b9664637d24a43ba4d0d79c7b956fa.pdf?index=true
    • https://uploads.strikinglycdn.com/files/c19bac83-f5cf-4bef-81f3-1a0fac508a91/thinkpad_t430_battery_price.pdf
    • http://pogudex.epizy.com/getegagizatesem.pdf
    • https://uploads.strikinglycdn.com/files/bf9c23ff-fce5-44a3-aa01-f2cfdbf91fcf/how_to_start_craftsman_rototiller.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_off0000f27a.bin
82ea65d28d4cd149a9568838654c7ad16c4708f00faa3b5bb9094a1c8ad01194		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF27A 5500 bytes
font_01_sfnt_off0001049e.bin
debdcba48eb856bcfa2aee07d238aef1299d2cb2f72cda400e9f0ab40e347c7d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1049E 11324 bytes

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