Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c67d32c14f5d6ce…

MALICIOUS

PDF

91.0 KB Created: 2021-04-01 15:53:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 444b972ad7cddf085f35a74f44bfbd79 SHA-1: b055bebcba3fd36f549b2fb312d73dbdc6d7d67e SHA-256: 7c67d32c14f5d6ce3b0c2ec872ed4f606fb5dbf0c463dce25898e833490f8780
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to distribute further malware or phishing content. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

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://pelibifir.ru/123?utm_term=sickle+cell+disease+journal+pdf
    • https://dirotigakavomak.weebly.com/uploads/1/3/4/2/134235834/6b130cf1.pdf
    • https://cdn.sqhk.co/kogujipubap/jhc9Tgd/farm_story_2_online.pdf
    • http://xujaxul.mywebcommunity.org/biparikurizat.pdf
    • https://birobidusizal.weebly.com/uploads/1/3/4/6/134638138/2b34d5dbb87d47.pdf
    • https://cdn-cms.f-static.net/uploads/4459791/normal_600ac7dda9b7d.pdf
    • http://mesanezedid.mypressonline.com/67767611720.pdf
    • https://cdn-cms.f-static.net/uploads/4474998/normal_5fdbfc5331074.pdf
    • https://cdn.sqhk.co/burajugi/jfidZja/cat_runny_eye_and_sneezing.pdf
    • https://cdn.sqhk.co/tinulafi/iighjfL/the_amazing_maize_maze_new_york.pdf
    • https://cdn.sqhk.co/sakiforivona/B8ighaA/tewebisepune.pdf
    • http://fanisore.sportsontheweb.net/51916306587.pdf
    • http://xekalabaxuv.medianewsonline.com/absolute_power_of_questioning.pdf
    • https://cdn-cms.f-static.net/uploads/4368479/normal_5fda5ec224742.pdf
    • http://raxewaponoxiv.mygamesonline.org/technical_writing_course.pdf
    • https://cdn.sqhk.co/jovakuki/iepy2I7/jajugatejimamomekejuk.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://b7eb3c74-9f10-4efd-a612-efb7ea03662f.filesusr.com/ugd/7198c1_15dc96be41454693b59ae4e0fc28d82c.pdf?index=true
    • https://689a2394-1721-4ce0-b6f7-af9f1dc0d621.filesusr.com/ugd/0f5b72_abbf100675674a2c904a85dbd8b43d25.pdf?index=true
    • https://1682489e-d94b-4f22-b6a6-c8ecb623ca2e.filesusr.com/ugd/5f226e_c1ffb8a790f74fd386f11e85ac4335be.pdf?index=true
    • http://peruroz.onlinewebshop.net/sokal_biometry_download.pdf
    • https://dbb1fad9-9c05-458f-9e32-bc0b7f65d7ec.filesusr.com/ugd/451461_79e43a28026c4beb87153e2c1713f8fd.pdf?index=true
    • http://zedowep.atwebpages.com/34638275676.pdf
    • https://d04c2b29-3777-4fe6-aaa9-ab96f87c3324.filesusr.com/ugd/43eb95_bb848ea07c7c4d0aa4e84c539112c201.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_off00012727.bin
50bf58f240e180c1ba098934711571efd4265c11fe756af60ec919954fe94a16		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12727 5392 bytes
font_01_sfnt_off00013994.bin
b95247cb98ecf15e3dad688b05a1acd06a77c68dbe467eff88bfa8b8b32ef4e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13994 11192 bytes

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