Malicious PDF — malware analysis report

Static analysis result for SHA-256 c17a24ad3a8338ab…

MALICIOUS

PDF

77.3 KB Created: 2021-06-11 05:29:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 630b369f8104f7a03d05b967b9cbebe1 SHA-1: 698bcfedf258d3532cd191f9a4dc2ca3cd62d4cc SHA-256: c17a24ad3a8338ab8afd697a160a2d56e84f2639e5a3460e6aba5b30db5ff6f3
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 pointing to link farms, which is a common tactic for phishing or distributing malware. The ClamAV detection and ML classifier strongly indicate malicious intent. The document body text, though heavily obfuscated, suggests a lure related to 'unique caller tunes'. No scripts were extracted, but the PDF structure itself facilitates the redirection to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://queure.ru/pbw?utm_term=unique+caller+tunes
    • https://static.s123-cdn-static.com/uploads/4379229/normal_5fde8a4790457.pdf
    • https://tulofezufiruz.weebly.com/uploads/1/3/1/4/131409090/8103016.pdf
    • https://wimupivirexov.weebly.com/uploads/1/3/4/9/134901171/d79eccdf.pdf
    • https://kojigoromemopem.weebly.com/uploads/1/3/4/0/134000229/902a67e.pdf
    • https://gazetitorujij.weebly.com/uploads/1/3/4/5/134599815/noxatuxawugafi.pdf
    • https://cdn-cms.f-static.net/uploads/4450243/normal_60323d7a684b0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://jowugaredite.pbworks.com/w/file/fetch/145089177/bamub.pdf
    • https://uploads.strikinglycdn.com/files/0e3392cc-98c0-45cd-8a60-6bb3f9f2ce21/cloud_9_vapor_and_e_cigs_north_carolina.pdf
    • https://uploads.strikinglycdn.com/files/bd5c15f3-dbd1-4306-b850-57edb51a179b/how_to_apply_denture_adhesive_strips.pdf
    • http://tukosifana.pbworks.com/w/file/fetch/144828498/minecraft_3d_shareware_v1.34_download.pdf
    • https://uploads.strikinglycdn.com/files/93e31366-c698-4599-8dc7-dc7441a9eb86/wanderer_above_the_sea_of_fog_summary.pdf
    • http://rorazokazog.pbworks.com/w/file/fetch/144505407/pigenafitikateku.pdf
    • http://gepefupugalu.pbworks.com/f/cant_connect_subwoofer_to_samsung_soundbar.pdf
    • https://uploads.strikinglycdn.com/files/61d9fe29-4314-4c41-b664-1900da53bffb/swiffer_wet_jet_nozzle_not_spraying.pdf
    • http://fetinaduv.pbworks.com/w/file/fetch/144821385/how_to_clean_prius_c_battery_fan.pdf
    • https://uploads.strikinglycdn.com/files/da045b2c-68df-4e8f-b3ae-64a19c629f27/jarup.pdf
    • https://uploads.strikinglycdn.com/files/493a8f12-cffd-486f-8a7f-37ace53bfbbe/can_money_buy_happiness_essay.pdf
    • https://uploads.strikinglycdn.com/files/d26e134d-8662-4197-9d55-9ee9d0feea01/kobalt_steel_adjustable_rolling_miter_saw_stand_manual.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da6a.bin
daa02c865749c49e8c493f532852d12afc8405bfaa97ad22d64667c34286fa55		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA6A 4912 bytes
font_01_sfnt_off0000eb34.bin
55198017fff0e1bd61886516ac3086755ceb4d8ba586d4851f91cb41cd8f2ebd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB34 11532 bytes
font_02_sfnt_off000112d0.bin
764fe263e68fd20aff2bbd96e69f5a400d440299d02096befa162391f913c7cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x112D0 16144 bytes

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