Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f4a97f7491b08f0…

MALICIOUS

PDF

78.3 KB Created: 2021-03-13 14:29:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0ab97818ecba5691a2f56eea06665a22 SHA-1: 28df824c562b37138b239ed5faa800625fd5699a SHA-256: 0f4a97f7491b08f00b1dca06cb52e7edd0b3287258ca275658d3303483576877
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with heuristics identifying it as a "PDF_SEO_LINK_FARM" and a "PDF_PHISHING_TROJAN". The document body, though heavily obfuscated, contains keywords related to ukulele chords, suggesting a lure to disguise the malicious intent. The primary URLs extracted point to suspicious domains, indicating a likely attempt to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://druttle.ru/award?keyword=movable+ukulele+chords+pdf
    • http://bilkan.fun/difference_between_eluviation_and_illuviation0sff3.pdf
    • https://cdn-cms.f-static.net/uploads/4416666/normal_60446f4346b88.pdf
    • http://constructionhouse.info/altered_carbon_netflix_season_3_release_datev7pwy.pdf
    • http://itactical.xyz/physical_chemistry_atkins_11th_edition9gs57.pdf
    • https://cdn-cms.f-static.net/uploads/4449768/normal_60146feb32a7b.pdf
    • http://fitokaps.xyz/how_to_fix_xbox_360_update_failedy1246.pdf
    • http://nijikelax.22web.org/god_of_war_ascension_titan_game.pdf
    • http://baltika-trans.com/mepulidilorap26jam.pdf
    • https://cdn-cms.f-static.net/uploads/4384461/normal_600b07ab1291b.pdf
    • https://cdn-cms.f-static.net/uploads/4483854/normal_604c9ec2b6a66.pdf
    • https://cdn-cms.f-static.net/uploads/4491670/normal_600a55374f9e1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://eda93683-a6ca-45e9-8056-ca7adea7f1dc.filesusr.com/ugd/d655db_98f539d4a5984f4ab7dc43ecd4fb3589.pdf?index=true
    • http://fudusimudupanu.rf.gd/rakanutalipo.pdf
    • https://ec8c99fd-5413-4e38-b6a0-2ccbba71fc6f.filesusr.com/ugd/de02f3_5b82842b9d39424fa47a3bf4d1899be7.pdf?index=true
    • https://29159626-56e2-4eb2-a8c1-eb081f451e44.filesusr.com/ugd/a58502_8b74224e06f74d7584838509c4dea5d3.pdf?index=true
    • https://c03439ef-6557-4199-865e-586791a52b6c.filesusr.com/ugd/6bb4a2_6f6ea2e0907d440da2545f2465e65560.pdf?index=true
    • https://144ece88-722e-4d59-a9d1-ae16887514c2.filesusr.com/ugd/48b17f_05cbcce465a4408b9cb16b5d0d6639e6.pdf?index=true
    • https://s3.amazonaws.com/tezude/34440792382.pdf
    • https://ec451167-49e0-489e-a150-d7dc0ecf9264.filesusr.com/ugd/fe0276_7dcc1180734e4b80ae1ac71708755d9c.pdf?index=true
    • https://2703069b-a6ff-4ff9-983c-db139a8d76ba.filesusr.com/ugd/8b61cf_555dcb484f43469aa60f9173b21a4179.pdf?index=true
    • https://s3.amazonaws.com/bomupi/99988234110.pdf
    • https://68a74d12-89ac-4a94-b826-09ad332a30bf.filesusr.com/ugd/1a0392_97156b9d308d428ca5595b3eec644645.pdf?index=true
    • https://bef89f6e-6323-4b84-ad9d-a44490bfcc4f.filesusr.com/ugd/96768c_00fcd1487fcc4ff484d697040aafc9a8.pdf?index=true
    • http://pinamagowejut.epizy.com/hangout_app_for_mac.pdf
    • https://557345b1-98c6-442d-b460-9e357c178e5b.filesusr.com/ugd/dfb5f8_11336537430849b68103b0a146e82dc7.pdf?index=true
    • 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_off0000f283.bin
7eae01336a693dab7ed295e4c0848c73572745d3cd75b6d3b8815150d28bb1b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF283 5512 bytes
font_01_sfnt_off00010549.bin
15cee52139efe36c9f0852be3d6c4bd82f235c97b928049d049bfebe35cc1eba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10549 11268 bytes

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