Malicious PDF — malware analysis report

Static analysis result for SHA-256 f637be40b38531fb…

MALICIOUS

PDF

79.5 KB Created: 2021-01-01 19:42:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: c24867e5c1c2761451ce1ae831bce668 SHA-1: 77d5beafcffa77324b03bc84954f6205d440ce64 SHA-256: f637be40b38531fb5c99bbf1da15c5407f73f1912f0cc730e2350f12c512e1e6
156 Risk Score

Malware Insights

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

The sample is a PDF document containing a large number of external links, many of which point to other PDF files. This behavior is indicative of a link farm or phishing campaign designed to direct users to malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://trafftec.ru/strik?utm_term=gon+match+3+puzzle+apk PDF link annotation
    • https://cdn.sqhk.co/salenasova/yjhg8ja/gt_nickname_generator.pdfIn PDF document text
    • https://cdn.sqhk.co/kokuxisa/ihipqhe/inside_out_and_back_again_left_behind_poem.pdfIn PDF document text
    • https://fezulenigi.weebly.com/uploads/1/3/4/4/134485980/dejibefuvekuda.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365591/normal_5f984e12a3639.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465556/normal_5fcb9c5bc8865.pdfIn PDF document text
    • https://cdn.sqhk.co/rewakevutel/hlh1jfI/walabifobepidasivisevuv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480582/normal_5fd8d28e07970.pdfIn PDF document text
    • https://cdn.sqhk.co/sidogorego/e8Vghgd/ice_cream_truck_song_roblox_id.pdfIn PDF document text
    • https://wemugevesusufe.weebly.com/uploads/1/3/4/4/134467109/fixavuvodofafo-lujuz.pdfIn PDF document text
    • https://cdn.sqhk.co/mawejoxejobe/gFxgjNc/airport_traffic_control_game_online.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/56543cc4-7c15-403f-8802-cd2be6ea5c4b/28304160982.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2e699b7-1abf-4beb-96ce-6b43ede6814f/stickman_arrow_archer_fight_game.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d1b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1B1 5208 bytes
SHA-256: 9d2a9efa5d86929aba51d52355bc7348852c06ba3e25a413516f687380a371b1
font_01_sfnt_off0000e349.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE349 2712 bytes
SHA-256: 92a5c57a1e87ee68d84cbd6ca5529f8513c722ef34c5b46be3a18438647e720c
font_02_sfnt_off0000ef25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF25 13552 bytes
SHA-256: 8abcd58ec8455dcedbd3ab43c1216ed742f888f1d39ec83ec72027fe124072cb
font_03_sfnt_off00011bb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB1 16184 bytes
SHA-256: f3bb9c76089be319f76de7604207c8b91a6807ca568d3dff1e1f529d308bd850

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