Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddb245969dd30b32…

MALICIOUS

PDF

100.9 KB Created: 2021-03-29 21:20:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1d7232fdd5fffb6e77adb653bba0bc22 SHA-1: e463ee5fa0eeebb87abf26ec58303f4d9faf6dd3 SHA-256: ddb245969dd30b32430ee6d122eebd881699627f9ea5f81caf0e490a3efeb692
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 of which are disguised as academic papers, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs are likely used to redirect users to malicious sites for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://ponafet.ru/award?keyword=pesquisa+em+educa%25C3%25A7%25C3%25A3o+abordagens+qualitativas+marli+andr%25C3%25A9+pdf
    • http://flebolog24.com/729132621052pdz1.pdf
    • http://cz-nitrof.website/the_red_jumpsuit_apparatus_album_zipr6k31.pdf
    • https://kobetuditi.weebly.com/uploads/1/3/4/4/134446504/ecc87fbb7.pdf
    • http://werenntaq.online/jamaica_images_clip_art_christmassylb8.pdf
    • http://help-feedback-amzn6.xyz/64901071071icd6o.pdf
    • https://neboxikadifi.weebly.com/uploads/1/3/4/5/134588308/da7b1e907fdc.pdf
    • http://kpupnov.pro/hallmark_movie_premieres_20209rrqn.pdf
    • http://idealica-italiaoficial.site/audio_songs_bollywood_freexvp8q.pdf
    • https://soluvixam.weebly.com/uploads/1/3/0/8/130873975/0ec151028.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://df4002df-ed14-466c-b758-10ced248c840.filesusr.com/ugd/3b03e6_818462554a324b99b977d0bec562a964.pdf?index=true
    • https://uploads.strikinglycdn.com/files/37f55c64-87f0-4c3d-b727-218bf6e6bf0a/how_to_charge_yinge_mini_wand_massager.pdf
    • https://09972071-4174-499b-90b1-de3619f59f53.filesusr.com/ugd/d1c05f_8ed41de253424b1e8ec09c097394859e.pdf?index=true
    • https://uploads.strikinglycdn.com/files/1c0f93e4-ebb0-4415-921c-f4ea67b8bcbc/starcraft_super_lite_311bh_reviews.pdf
    • https://2a082fd4-e93f-4b8e-9e59-408fa046b31c.filesusr.com/ugd/e334dd_658d723dee0f4c64bc30946671e9d015.pdf?index=true
    • https://17851959-1482-4b49-8222-7b7b0c628459.filesusr.com/ugd/3cb679_ca5c3b6d4580499fb979df226cb2b9e8.pdf?index=true
    • https://uploads.strikinglycdn.com/files/f102abc5-b2fd-4923-8db0-02bf0f728620/is_executive_order_6102_still_in_effect.pdf
    • https://86908e24-11f3-43a1-9346-bf531f45ee0b.filesusr.com/ugd/97493d_e53ac040ea924772baee2f394341972e.pdf?index=true
    • https://f110cc6a-49d6-427c-9ab6-a3a4d323b004.filesusr.com/ugd/9e53d4_de0298c9e1da405da6e41f8e0569979e.pdf?index=true
    • https://1cdd1dcb-54a5-4750-95ad-c4cce9a68cd1.filesusr.com/ugd/1e32c2_98e65245ba2547a8814ffa9f70614dfd.pdf?index=true
    • https://4ec63ec4-77bf-4499-900e-7c522af20654.filesusr.com/ugd/35bdb9_1702a55ab0f7439b814af63f912b774f.pdf?index=true
    • https://uploads.strikinglycdn.com/files/1943214e-1e9d-4e2b-a99c-c2fdfaaf5676/95864818140.pdf
    • https://uploads.strikinglycdn.com/files/cfe3b997-bb10-42c1-9f88-040a9d154d4b/kenwood_dpx501bt_demo_mode.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://dx.doi.org/10.24109/2176-6673.emaberto.5i31.1605
    • 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_off0001479d.bin
661775d3cd6feeed9f0482f1252268aea0e700e4ae7296aafe33ede927711f1a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1479D 6444 bytes
font_01_sfnt_off00015c57.bin
7cda6fec0ec6963cb8f15e24e10d404e811651f099461dfa4d2c2329af6f13c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15C57 12760 bytes

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