Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4f88e72d7217cf9…

MALICIOUS

PDF

76.1 KB Created: 2021-05-24 09:16:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4929c178aa173d61049c6e080a387847 SHA-1: 29d4a9ba20bb115e9583f7d03c90fc0a5e3db54a SHA-256: b4f88e72d7217cf9edf6963701c1c0de76aa01611bfd915922ffebd7bd921093
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF files hosted on platforms like Weebly and Strikingly. One of these links, https://ponafet.ru/strik, is directly embedded and likely serves as a redirector or landing page for malicious content. The ML_NYX_PDF_MALICIOUS and ClamAV detections strongly indicate malicious intent, consistent with a phishing or malware distribution campaign.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ponafet.ru/strik?utm_term=cram-a-lot+baler+parts
    • https://jimekomu.weebly.com/uploads/1/3/1/4/131453536/367861d14ec639.pdf
    • https://fidojosamesevuf.weebly.com/uploads/1/3/4/5/134594598/54a1b8ea1adb.pdf
    • https://genunilime.weebly.com/uploads/1/3/4/3/134344847/ef53257f7c4257.pdf
    • https://sopogokatoluj.weebly.com/uploads/1/3/1/0/131071191/ce7998d0af9658c.pdf
    • https://sekeratogo.weebly.com/uploads/1/3/4/6/134683690/f5616e.pdf
    • https://vazigawexike.weebly.com/uploads/1/3/1/6/131606690/621850.pdf
    • https://repotadidutu.weebly.com/uploads/1/3/4/3/134310826/fezeju.pdf
    • https://gegirugotosizuk.weebly.com/uploads/1/3/5/3/135397722/xiturepume.pdf
    • https://jodulimije.weebly.com/uploads/1/3/4/7/134732884/mijuko_lutejevefuf_punenewu_mekufanosuk.pdf
    • https://gikanusubidi.weebly.com/uploads/1/3/4/7/134756500/8762375.pdf
    • https://xagofutaruv.weebly.com/uploads/1/3/4/3/134344009/9d5ed565a0184e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/7b49e163-0460-4fad-82d0-47a5f290283e/nato_alphabet_mancy.pdf
    • https://s3.amazonaws.com/mejados/the_joy_of_sex_book_movie.pdf
    • https://s3.amazonaws.com/dukajevo/phool_bane_angaray_movie_song.pdf
    • https://uploads.strikinglycdn.com/files/855cf171-384d-4077-8a98-923e79b6cb1d/50045095856.pdf
    • https://uploads.strikinglycdn.com/files/21fd1162-3f20-485d-b1a0-7cae220d84ae/daxejukevufupoxojuni.pdf
    • https://s3.amazonaws.com/vosimalume/cash_money_online_application_form.pdf
    • https://uploads.strikinglycdn.com/files/f85ba82c-79c5-4466-afbb-cb7e95791a0b/10_frame_langstroth_beehive_plans.pdf
    • https://uploads.strikinglycdn.com/files/ee617558-1004-4073-b4fc-42cf39a03a9c/how_to_attach_the_upholstery_attachment_on_the_hoover_steamvac.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_off0000de74.bin
3dfdfd42dd310a5ee156afc7d6deb6cc82024b8fc2e5253aae36c19d1af87707
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE74 4796 bytes
font_01_sfnt_off0000eeba.bin
1eb33f23ae9f91edc0a275d38b539a6456284bd056c079aa888dde770bd6098a
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEBA 11256 bytes
font_02_sfnt_off000114fb.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c
pdf-font-stream PDF embedded font (sfnt) at offset 0x114FB 4324 bytes