Malicious PDF — malware analysis report

Static analysis result for SHA-256 93f91feefbd434a8…

MALICIOUS

PDF

80.0 KB Created: 2021-03-26 03:52:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 36ca0b1a81ce356e5215989efea707d8 SHA-1: 746a7b79d2aa77797c78083693235da236aa95d3 SHA-256: 93f91feefbd434a894fb5a07df49e55d4f2b4515017035e10ceed5687b3a1724
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and an ML classifier, indicating a phishing or malicious content delivery attempt. The document contains a large number of external links, with one prominent URL pointing to 'mezovuduw.ru', suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://mezovuduw.ru/aws?utm_term=do+you+own+your+adt+equipment
    • http://ruvujagefeko.mygamesonline.org/aircare_ma1201_evaporative_humidifier.pdf
    • https://dogaralezuj.weebly.com/uploads/1/3/1/6/131637140/8623449.pdf
    • https://batezumepew.weebly.com/uploads/1/3/4/4/134479003/delaxoxupofu.pdf
    • http://kazexajisodibu.medianewsonline.com/mavibomit.pdf
    • http://figimumagoko.mygamesonline.org/spinach_soup_diet_for_weight_loss.pdf
    • https://zabagazepag.weebly.com/uploads/1/3/4/4/134498959/6900532.pdf
    • https://jikuvagipotax.weebly.com/uploads/1/3/4/6/134647272/pelepo.pdf
    • https://moraraxewurazi.weebly.com/uploads/1/3/4/0/134042425/be2e1b50c14f97d.pdf
    • http://xoziduso.mypressonline.com/colt_ar15_pistol_lower.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://e6f9d1db-9bad-45ba-a188-0e8e378e8087.filesusr.com/ugd/99b222_1d1786c136da41e2bba9b4f5a7899997.pdf?index=true
    • http://bujekotu.atwebpages.com/somusinedosizumitekovawo.pdf
    • http://nunavaxukozu.onlinewebshop.net/accountancy_class_11_ncert.pdf
    • http://ratobewiwigu.atwebpages.com/takigavumisejesegiz.pdf
    • http://newepizudef.atwebpages.com/esl_possessive_adjectives_worksheet.pdf
    • http://lawesiwewif.onlinewebshop.net/94408451646.pdf
    • https://1c437d0a-cccb-4a8a-93f1-39e0b5126915.filesusr.com/ugd/b91566_d79969fd594549b7bb560016c049caa9.pdf?index=true
    • https://e05bdd54-7536-4db1-b7ed-110d7b12163e.filesusr.com/ugd/dd5a80_82b405ac3cfe4cb5bc85940a8b58e181.pdf?index=true
    • https://6f847715-c85a-45d9-ae5c-7c68cc800588.filesusr.com/ugd/6e100b_5393370db70c4ebf9f3cce2e5b176faa.pdf?index=true
    • https://fb413987-6e77-4bf1-aaa6-e97eb550fbee.filesusr.com/ugd/108936_bba52bcd8e9c4b148a8dd574653bbbe6.pdf?index=true
    • https://584dc5e1-4449-4bca-b3d9-d0e1fa08a972.filesusr.com/ugd/185caa_b0d73936ed8b4e89b982845605ec4f20.pdf?index=true
    • https://db6d201d-bdff-4648-9982-d9cfaac7639e.filesusr.com/ugd/98857b_2b543bc17ae246cd84a930d107754929.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_off0000fa2a.bin
29812b95d2c653d874304ab9ab009b7a35c5f2db9a6f63645e8e6f0c71778d2f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA2A 5216 bytes
font_01_sfnt_off00010bee.bin
afda3cb43f083430e80db5955c86c51061ad2d78835fb453fa870b294c96e8de		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BEE 11512 bytes

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