Malicious PDF — malware analysis report

Static analysis result for SHA-256 627756ade379b8db…

MALICIOUS

PDF

100.2 KB Created: 2021-04-09 04:44:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 49eb10bbcb1166012ff55c894632fdb6 SHA-1: 7a4eeec3f8025ca34221abef59187bc9ee5ec690 SHA-256: 627756ade379b8db9c374b4a1852083d6fe57cefe4e0ad07969e10a4aee9c3dd
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying a 'PDF link farm' designed to direct users to various resources. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests a common tactic of encrypting payloads and providing decryption instructions to bypass gateway security.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://zajinet.ru/strik?utm_term=plan+de+negocio+template+word
    • https://static.s123-cdn-static.com/uploads/4403561/normal_6004b8661751e.pdf
    • https://cdn-cms.f-static.net/uploads/4451762/normal_6017a45471f4b.pdf
    • https://cdn-cms.f-static.net/uploads/4417137/normal_6033856b55c88.pdf
    • https://static.s123-cdn-static.com/uploads/4404488/normal_5feb54a23edee.pdf
    • https://cdn-cms.f-static.net/uploads/4470533/normal_5fda6537ef518.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/5e5494f1-fe86-495c-a364-a2ac4e8effef/crossfit_gym_wear.pdf
    • https://520c840f-7702-4e28-87de-278da5b03b63.filesusr.com/ugd/e633b3_e2c3a0e115e64694b01f3529e93df4b4.pdf?index=true
    • https://s3.amazonaws.com/wurivuve/printer_canon_pixma_g2000.pdf
    • https://uploads.strikinglycdn.com/files/64294e2b-9ad4-4f52-8e50-2f51a611df72/what_is_meant_by_quality_in_project_management.pdf
    • https://s3.amazonaws.com/nuxulikiwab/rpg_plot_hook_generator.pdf
    • https://s3.amazonaws.com/debiwelof/queen_size_wooden_platform_bed_frame.pdf
    • https://uploads.strikinglycdn.com/files/56d44956-9f84-4fc9-8791-39d06ae24e19/7063191956.pdf
    • https://s3.amazonaws.com/gewuwasi/core_cutting_test_report.pdf
    • https://uploads.strikinglycdn.com/files/ab4e536a-cf38-4fbc-8262-b41b5c2c30ba/how_long_to_learn_barre_chords.pdf
    • https://0b21792c-a699-4cf4-8833-5910c6ad58af.filesusr.com/ugd/b0b521_f04d47a413b146f7bbac2a2f646f242b.pdf?index=true
    • https://s3.amazonaws.com/gavexilatuvitaz/best_bike_app_for_android.pdf
    • https://s3.amazonaws.com/dazawojob/zebodokinotarizaxaburomo.pdf
    • https://s3.amazonaws.com/wewuxuviwar/angiotensin_ii_receptor_blockers.pdf
    • https://uploads.strikinglycdn.com/files/7a2dc61d-50eb-4c4a-b601-b5fce73b76ac/90060251637.pdf
    • https://uploads.strikinglycdn.com/files/d8248a58-d133-45bb-abca-bb036aff1fdb/foxam.pdf
    • https://uploads.strikinglycdn.com/files/ad9c7567-547d-436e-82c8-24bd0472887d/jowezarudebamimokanak.pdf
    • https://s3.amazonaws.com/gorajikunobixi/vaaste_hd_video_song_720p.pdf
    • https://s3.amazonaws.com/wozoxub/buwopaxa.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_off00014965.bin
6d879236aa70f5cb6dfe14b677616d248bc0d78506cbf597f2b8605183bcd9eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14965 5308 bytes
font_01_sfnt_off00015b73.bin
0251f7baba90a3852e68eb87a56dc8be7febb43d4b97e6df9a1d540f8c08c9fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15B73 11624 bytes

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