Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8a225194b2de597…

MALICIOUS

PDF

92.5 KB Created: 2021-02-17 05:10:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 71457e2bc90c0cd469dfa7b31d50ba23 SHA-1: 29f3396ffa9d17a94a2c4deb9629d4aac38a8861 SHA-256: a8a225194b2de59719a86e5edb6de0405ecb51eaeb20ceba13a772a3e370f6d2
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 trojan. It contains numerous embedded URLs, many of which point to disposable domains and appear to be part of a link farm designed to redirect users. The document body, though heavily obfuscated, suggests a lure related to a book title, likely to entice clicks on the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jottigo.ru/123?utm_term=is+the+book+in+cold+blood+based+on+a+true+story
    • http://repair-foto.ru/42282067177hmden.pdf
    • http://afracheat7.xyz/risijewekilalapodomuvukflc3h.pdf
    • http://fishing-rods2.club/82304621868p2eni.pdf
    • http://afracheat3.xyz/citizen_watch_co_water_resist_base_metal_yp_5530g3hl1.pdf
    • http://sallles.ru/uad_apollo_twin_usb_price_in_indiacsjtf.pdf
    • https://dirotigakavomak.weebly.com/uploads/1/3/4/2/134235834/af476ea6c09d4b.pdf
    • https://sunowakodi.weebly.com/uploads/1/3/2/8/132814938/xozoxanapoliva.pdf
    • http://axecheat5.xyz/dank_snapchat_lensesn4i7o.pdf
    • http://poroda.site/dxcpl_directx_11_emulator_download_wdvdyc.pdf
    • https://xikoroto.weebly.com/uploads/1/3/4/3/134338579/xananiwitajikupumi.pdf
    • http://xxlmature.site/academia_boa_forma_telefonegk4wq.pdf
    • https://cdn.sqhk.co/malevevipali/Ngigdjb/zitufepexenege.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • 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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010a8a.bin
a98fe4b755c23972e5e12219671a134644b071fdc299460c933a839b1288a5d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A8A 5152 bytes
font_01_sfnt_off00011bf7.bin
1f92efb8f26d720ad87f76a2197d4a8de000ceda233b70ef4e5ae96ec72cfbb0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF7 11108 bytes
font_02_sfnt_off00014213.bin
8345d1cc2b6b461b856d0454e2cf67edf5851291b6d0ebf21a7da0c9813a2b7f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14213 16028 bytes
font_03_sfnt_off0001565b.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1565B 4324 bytes

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