Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9c69cf741e4043a…

MALICIOUS

PDF

84.3 KB Created: 2021-03-12 00:27:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ea4137d48c977ae6a899b162586f985c SHA-1: 2b8d2c02ca3ee875d3851fc399a064082fcfefbf SHA-256: a9c69cf741e4043ac9a0f21a565cb3fe05f246491b698443d2d4f93db8a28bd7
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. One of the primary external links, 'https://vilenefex.ru/123?utm_term=abzan+company+modern+guide', is likely part of a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

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://vilenefex.ru/123?utm_term=abzan+company+modern+guide
    • https://dogopakuva.weebly.com/uploads/1/3/4/6/134698139/denesanesur.pdf
    • http://kutebirodomo.22web.org/talimoxu.pdf
    • https://salapabozob.weebly.com/uploads/1/3/5/3/135326799/barupewovikefo.pdf
    • https://tobevasisutigi.weebly.com/uploads/1/3/0/8/130814636/9352810.pdf
    • https://fekazivijiwawad.weebly.com/uploads/1/3/4/6/134687088/zitokebifusut_pejivom_makamuv_folewijezilukog.pdf
    • http://zakofuta.66ghz.com/best_monstera_trellis.pdf
    • http://betifogolejom.iblogger.org/bond_duration_excel_template.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://29474179-7c7c-44ae-84e0-3c37792f2e25.filesusr.com/ugd/7f817d_89685fbff9714e51a3e8825229ff3478.pdf?index=true
    • http://nogurinuzelajer.rf.gd/20716300095.pdf
    • http://zajozikudesurek.epizy.com/top_live_tv_apk_apps.pdf
    • https://s3.amazonaws.com/luxelula/what_kind_of_weapons_do_enhancement_shamans_use.pdf
    • https://f495c71d-628d-4070-9a3d-b699cbb46ba4.filesusr.com/ugd/d99ef3_26d5bad1254f425596758edd5749ad14.pdf?index=true
    • https://s3.amazonaws.com/gapuruxumeg/gozevu.pdf
    • http://kejefutipetube.epizy.com/john_deere_l110_mower_deck_belt_diagram.pdf
    • https://s3.amazonaws.com/vinivuxo/shiva_cartoon_video_2018_tinyjuke.pdf
    • https://527ed197-5826-4432-9c89-449afa9d705e.filesusr.com/ugd/65ef70_f77b1861708f4f0c85cc18fa5e5022a0.pdf?index=true
    • https://s3.amazonaws.com/mukut/how_long_does_coleman_lantern_fuel_last.pdf
    • https://s3.amazonaws.com/figidireki/how_to_replace_a_furnace_ignitor.pdf
    • http://ranesewigiz.epizy.com/2007_mini_cooper_repair_manual.pdf
    • https://9e7b01ce-91ce-414a-93c5-ade8df4b7359.filesusr.com/ugd/cfbfd2_c29a0cd868184c1a901beca67c680c00.pdf?index=true
    • https://s3.amazonaws.com/tapelu/adjectives_colors_worksheets.pdf
    • https://6f4861c6-cdf0-4a5f-ba2d-f9c5e5bfbee6.filesusr.com/ugd/77941b_e1ed1dae8fe9458b8301cdebf74ac8e7.pdf?index=true
    • https://s3.amazonaws.com/lemerisinivum/govalemezu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff58.bin
f9e2f6b8f4fe0d7834f7c9ab2bc25638f415393a873428b289cad45c7492c309		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF58 5268 bytes
font_01_sfnt_off0001111f.bin
51714d30b833259cbf1ef32625cfca0e0711257faa353dfb8d66ece486fe71a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1111F 10664 bytes
font_02_sfnt_off0001356b.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1356B 4324 bytes

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