Malicious PDF — malware analysis report

Static analysis result for SHA-256 f51fa912e00ddf76…

MALICIOUS

PDF

69.3 KB Created: 2021-03-27 12:14:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a050eab02f3ec58a67b1dd9456186151 SHA-1: 7e75c1aacc684d50e892cceaacfe561527cc33fe SHA-256: f51fa912e00ddf76bad377b0bf34f259c5fa144eb7347a81ce6dec0a6e3abd1f
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a significant portion pointing to Weebly and other hosting services, suggesting a link farm or phishing operation. The ClamAV detection and ML classifier indicate malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a social engineering attack aiming to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9678

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://botokaw.ru/award?keyword=everything+is+figureoutable+free+pdf+download
    • https://jikuvubavul.weebly.com/uploads/1/3/5/9/135964228/237214.pdf
    • https://tavugalijob.weebly.com/uploads/1/3/1/1/131164394/5b65cca0e72db.pdf
    • https://cdn.sqhk.co/pujapipiwat/hib0ii5/52999833785.pdf
    • https://minojesifivu.weebly.com/uploads/1/3/4/8/134860027/f19061.pdf
    • https://cdn.sqhk.co/segexiji/gjcgija/14179260822.pdf
    • https://cdn.sqhk.co/wexunaveb/eKjbkWC/it_events_singapore_2019.pdf
    • https://cdn.sqhk.co/vomisape/ijggehf/virus_shooter_shooting_game_apk.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/691511e8-f71b-4d21-aa2f-62d3c44b501a/how_do_i_get_my_hp_deskjet_2600_to_scan.pdf
    • https://uploads.strikinglycdn.com/files/476071e7-22c2-4720-978d-50b6866c85ba/chicco_bravo_for_2_stroller_weight.pdf
    • https://s3.amazonaws.com/dafumuxitupav/act_practice_test.pdf
    • http://musotosas.rf.gd/98270829534.pdf
    • https://uploads.strikinglycdn.com/files/20948754-4420-42b0-a683-0b92fcb9f45a/tazakakolewajovopipijede.pdf
    • http://warulutidodaluv.epizy.com/19284481198.pdf
    • https://uploads.strikinglycdn.com/files/7db9e55f-c072-4794-b71b-0b7d0adf8a3a/67350396353.pdf
    • https://uploads.strikinglycdn.com/files/b1dd01fa-2621-4ed9-ac10-c56cdd4ccbcd/73316999145.pdf
    • https://uploads.strikinglycdn.com/files/7fc30c7f-14a5-4393-9e67-0209b467b250/somewhere_over_the_rainbow_lyrics_and_chords_eva_cassidy.pdf
    • http://junulanomelab.rf.gd/aqa_biology_a_level_revision_guide.pdf
    • http://fixiwerasame.rf.gd/terojifukikifokuvuzuki.pdf
    • https://s3.amazonaws.com/wekibik/kaverajubikepuzebenubine.pdf
    • https://uploads.strikinglycdn.com/files/6a1c307f-c2b3-4d7d-8874-14952c9fbbab/21176113859.pdf
    • https://s3.amazonaws.com/norozovijalu/68156133182.pdf
    • http://titomozuluvexov.epizy.com/sudufabaregikopenonav.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db02.bin
c4acae440a4ef70debfb62e852596d09fa05afe396b06399facf8884221fec73		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB02 5652 bytes
font_01_sfnt_off0000ee59.bin
8376b0292ee6872e9e77b7404e7a69dcea9859e1a688413d35afaa271b1a0bc7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE59 10628 bytes

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