Malicious PDF — malware analysis report

Static analysis result for SHA-256 30412d70b658ca0a…

MALICIOUS

PDF

69.8 KB Created: 2021-03-26 08:36:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d961c249d8f4b65b7debacb17c183630 SHA-1: e630721211aff76ef9b6073aacee6e34f2ffa399 SHA-256: 30412d70b658ca0ad658a4c6d047829c19c5d4f2d7b822b3a281cfb29eb065c4
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan variant. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm or redirection mechanism to deliver malicious content. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and 'drawing histograms worksheet with answers', indicating a lure to disguise the malicious intent. No scripts were extracted, but the presence of multiple external URIs and the high confidence detection suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://leonvi.ru/wix?keyword=drawing+histograms+worksheet+with+answers
    • http://parazepurafeza.medianewsonline.com/31283131034.pdf
    • http://goldenframecollision.com/10165060088xletg.pdf
    • http://xudisoda.66ghz.com/zerexiva.pdf
    • http://jomikifu.medianewsonline.com/26280649319.pdf
    • http://puveputado.sportsontheweb.net/salefirixo.pdf
    • http://lidlid.xyz/99867299841lyid8.pdf
    • http://gilumesu.mypressonline.com/adulteration_of_crude_drugs.pdf
    • http://lobulezinovux.medianewsonline.com/multiplying_decimals_by_whole_numbers_area_model.pdf
    • http://walkover.me/29523841956xtsqw.pdf
    • http://auth02mobility.com/jamupiworomejonivaf5v.pdf
    • http://tekchambre.xyz/pedevejujijogupin1o311.pdf
    • http://fit-italy.space/identify_word_classes_exercises_with_answers9smu7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://sosefamip.epizy.com/redemption_at_hacksaw_ridge_book.pdf
    • http://sipanokule.onlinewebshop.net/38310733333.pdf
    • http://malebowepapin.epizy.com/zofumemidowoviburumut.pdf
    • http://mapureju.epizy.com/28719100731.pdf
    • https://34886cf3-15ed-44db-93e8-8979dc7c4cd7.filesusr.com/ugd/ea2c45_53461f58596d40dfb8c530b577d6e6af.pdf?index=true
    • http://jatugeset.atwebpages.com/altina_the_sword_princess_volume_15.pdf
    • https://4779f2f8-a33e-4327-9c78-21ee0bcf4620.filesusr.com/ugd/31bf02_ee93be923e984cff8741e4092cadf04b.pdf?index=true
    • http://tadoloko.epizy.com/telutevudikodozusidoj.pdf
    • https://38e81cab-313f-462b-917d-d566bf782aa4.filesusr.com/ugd/36aba1_5c2275ab215d4b7686ec9404cc404a35.pdf?index=true
    • https://181f3bdf-810f-4c34-abb3-9f3362228cd6.filesusr.com/ugd/30415f_bee9270bfc97491f8d36cf089276d670.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_off0000d3f0.bin
f823dfd05d6a807803720d4ef9a68459c89dd50e5c6eb055dbe22d95a446feaf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F0 5224 bytes
font_01_sfnt_off0000e5a0.bin
9c69ec5bf23f5d409386e3fed4570fb8cfeb140cf4d1fecf98b2c36fdd4c4e6a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A0 10580 bytes

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