Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe65fde7c84059ff…

MALICIOUS

PDF

96.6 KB Created: 2021-03-14 09:29:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ff63e05082524f7be6ea5230a3750e1b SHA-1: 1b7785ecfd239c0265478974152d9e11db474b38 SHA-256: fe65fde7c84059ff04cf39a9d808072d48eba9841b3b10b8789ce09af34bd5c2
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains a link farm with numerous external URLs, many hosted on disposable domains, suggesting a phishing or SEO manipulation tactic. The document body, though heavily obfuscated, appears to be a lure related to astrology books, which is a common theme in such schemes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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
  • 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://zajinet.ru/award?keyword=books+on+astrology+for+beginners+pdf+in+gujarati
    • http://digosige.mywebcommunity.org/sewidinuwe.pdf
    • https://javesuput.weebly.com/uploads/1/3/0/8/130873829/8188056.pdf
    • http://mebevevi.mywebcommunity.org/how_to_repair_remote_buttons.pdf
    • https://vuvonuzomuvi.weebly.com/uploads/1/3/4/5/134508102/8148723.pdf
    • http://powajaxib.medianewsonline.com/12859546428.pdf
    • https://cdn-cms.f-static.net/uploads/4475863/normal_603edf11a022c.pdf
    • https://kemosufasegu.weebly.com/uploads/1/3/4/3/134348140/mepadobif.pdf
    • https://cdn-cms.f-static.net/uploads/4458848/normal_5fe940b05f702.pdf
    • https://munowimil.weebly.com/uploads/1/3/1/4/131406650/1159197.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://a519209a-2b0a-481f-9fe9-460c873bdc80.filesusr.com/ugd/270e53_459a5240cec0453a9886a4460aa57b3b.pdf?index=true
    • https://01dc7cc6-b8ed-446e-8cc8-1ad78882ed38.filesusr.com/ugd/e23fbb_fe9802fc556e4be9b6eae3a48c9e3257.pdf?index=true
    • http://bopiguxa.atwebpages.com/72806126755.pdf
    • https://1350f94c-8d6f-42b4-8351-24983ad6a49a.filesusr.com/ugd/4aae87_e3cb8f588e0141bca541f987b0c5b2c8.pdf?index=true
    • https://627f215e-41ba-4aa4-9906-5f9f9d117739.filesusr.com/ugd/8ab72e_a256c2eaeed84201b0a11fb58bdc5e20.pdf?index=true
    • https://5b0ea1c3-b874-41d5-a3cc-49595beb80a6.filesusr.com/ugd/0c63be_149859ae5d9341e09498683484d4f13e.pdf?index=true
    • http://dopovis.myartsonline.com/80469759149.pdf
    • https://200c4c3d-185b-4246-b99f-f40cd7065c99.filesusr.com/ugd/3ed902_18b214809c2848fca08d02fff6bcf8f7.pdf?index=true
    • https://ac4cd5cf-e861-4b1b-a585-e47049f737a6.filesusr.com/ugd/843280_cb64f8e711504c0d8821783a80d7a04e.pdf?index=true
    • https://39dd5e1d-a581-41ec-a80f-9e19245c660f.filesusr.com/ugd/c2656d_e6d32ddaa8c141b7bfefb0331f2a591d.pdf?index=true
    • https://994180ce-385f-4272-9833-4a204a825e0f.filesusr.com/ugd/ec0c41_35d5a980aa4141c39be789b98fac6692.pdf?index=true
    • https://fad58b31-c538-4d3f-828d-7998eec853b9.filesusr.com/ugd/7e6083_d6e13ed774ab4e9d92e24b37ff3decd2.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000148f1.bin
e18f959ce2ad159e8ab2c7df40c338fba62a51763e18101b4f331e3d1d0ad95c		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x148F1 23304 bytes
font_00_sfnt_off00010f49.bin
ec9e071d278d881bc974c46af68faf30e3c9f18ef737c9b206356159cc3733be		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F49 5640 bytes
font_01_sfnt_off0001229a.bin
a2e2e7542ce1044bd54140e7ed8b0e9cf5329988f9de11e5d36e9061736b8a99		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1229A 11124 bytes

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