Malicious PDF — malware analysis report

Static analysis result for SHA-256 87341d4db2db03aa…

MALICIOUS

PDF

74.3 KB Created: 2021-03-26 08:51:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 837482811a4a94b4d5538ce1dc4f1bc7 SHA-1: df4734c4571d56f35c6f97342ec204131c237763 SHA-256: 87341d4db2db03aa7d9134e4a5f10567c0450cf3fc06a51b5749ffae314b2e65
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting a malicious intent to redirect users. The ML classifier and ClamAV detection strongly indicate maliciousness. The embedded URLs point to various domains, some of which are associated with hosting PDF files, likely as part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://nipisod.ru/123?utm_term=yiruma+maybe+sheet+music+free
    • https://liroxinumapidaz.weebly.com/uploads/1/3/5/3/135348088/b26a4f3691722.pdf
    • https://cdn-cms.f-static.net/uploads/4428061/normal_603e181d2e048.pdf
    • https://cdn-cms.f-static.net/uploads/4372723/normal_601495e01b1d4.pdf
    • https://cdn-cms.f-static.net/uploads/4368495/normal_603c515153fc0.pdf
    • http://bloodcraft.online/freddy_5_nights_game_online1pn6h.pdf
    • https://wobanuwu.weebly.com/uploads/1/3/5/9/135959505/dawoderoj.pdf
    • https://cdn-cms.f-static.net/uploads/4503387/normal_604d300a129d2.pdf
    • http://nizavevorupuj.mywebcommunity.org/english_american_literature_authors_and_their_works.pdf
    • https://bugabomusajo.weebly.com/uploads/1/3/4/5/134509224/nubokadagijowo-ferivesuki.pdf
    • https://fewebiporunivag.weebly.com/uploads/1/3/0/7/130775920/4733511.pdf
    • http://c-advance.space/46464294037nohyk.pdf
    • http://youralteragoods.com/39943021895rp22w.pdf
    • http://arfesopt.com/mufezukasikipeberazz8np.pdf
    • https://wexejapu.weebly.com/uploads/1/3/1/3/131384175/29dae89ea0746.pdf
    • https://xemexavowud.weebly.com/uploads/1/3/1/8/131857479/pojuvefut_pugateri_voxijapupuzotew_midujono.pdf
    • http://jarowulizose.sportsontheweb.net/1299918502.pdf
    • http://chaptejvxz.fun/davuwy1ca5.pdf
    • https://vusasetimonumak.weebly.com/uploads/1/3/4/8/134855164/rugasedupojiges.pdf
    • https://wesotapaxo.weebly.com/uploads/1/3/4/4/134488604/modojororipopub.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/4b1b05a4-8d2b-4b1a-9e16-db3d6c040027/jonufikuzosuvibadexedabit.pdf
    • https://uploads.strikinglycdn.com/files/6d6049ff-9a59-4659-a5d1-94fb1db3f0c1/bedusimarufufopaxi.pdf
    • 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_off0000e3d6.bin
dd1500ca61ce72c1ad461c3a86d0984997ed1e6ef31e52edf80d51f936bbfda6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D6 5292 bytes
font_01_sfnt_off0000f5b5.bin
256d725b881695c483b71224a6a3e839536e95ece3b32e331e7e9b661afea14b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B5 11480 bytes

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