Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc0a92d26c3a901e…

MALICIOUS

PDF

75.6 KB Created: 2021-04-17 01:05:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: deee7db513bde03726bec7f77602f5bc SHA-1: 115171845692e7b69bf6a2be82ba2b1c9de4abd8 SHA-256: cc0a92d26c3a901ecc3d0c38c18d0461764a60789ced2bb21f6fe41a6375094b
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many pointing to disposable hosting and employing UTM parameters, indicative of a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and numerous external URIs point towards an attempt to leverage external resources for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/strik?utm_term=bob+double+stroller+revolution+se+duallie
    • https://cdn.sqhk.co/negapevu/ijhjihq/at_t_mobile_transfer_app_review.pdf
    • https://goxesepejapumew.weebly.com/uploads/1/3/4/6/134609979/3971395.pdf
    • http://i-men.ru/add_custom_javascript_to_wix34xqv.pdf
    • https://vegiranelikir.weebly.com/uploads/1/3/4/3/134399044/megafivukikalagiko.pdf
    • https://cdn.sqhk.co/zalopubid/ighaijE/winterhawks_roster_age.pdf
    • http://jeweboz.iblogger.org/woxebezotarudaju.pdf
    • http://nesobaka9.xyz/which_intermolecular_forces_are_found_in_hydrogen_fluoridey6xoj.pdf
    • https://cdn.sqhk.co/jimumakevaji/iyjcigY/31388243134.pdf
    • https://zowisedaro.weebly.com/uploads/1/3/4/3/134355737/6573651.pdf
    • http://znalomstvavip.site/how_to_use_fine_chromatic_tunerw1gjn.pdf
    • https://ditomivowulute.weebly.com/uploads/1/3/4/6/134679561/3762906.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://6d5fec37-5936-4ae8-8938-03a86e982f09.filesusr.com/ugd/d4da64_d2acad61708643b48837b0fe7c07dcd1.pdf?index=true
    • http://guminol.epizy.com/the_son_of_neptune_graphic_novel_google_docs.pdf
    • https://1094d5c0-a920-47c7-a1de-7e2d56a92d84.filesusr.com/ugd/47b1e8_7c0ece6a88fc44dd858843c4c707a54d.pdf?index=true
    • https://357b8bef-7330-4cfe-b31d-389db25c4d5a.filesusr.com/ugd/4c76bf_364bd65932f34fa9b7245bfe06402a32.pdf?index=true
    • https://s3.amazonaws.com/fifuto/31468967130.pdf
    • http://vupikefugogulup.epizy.com/42447606046.pdf
    • https://023e3b0e-89aa-4e00-bd19-175c11a0a9c0.filesusr.com/ugd/5f4883_e6745dc982e348d4b7fda8c97666f1c0.pdf?index=true
    • https://s3.amazonaws.com/gomakobez/will_100_combed_cotton_sheets_pill.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_off0000ebca.bin
3fc2ff45968aee62b4f92cc2c6ad1f2018d21fda6f02ba57947d9992fc6b7423		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBCA 5068 bytes
font_01_sfnt_off0000fd17.bin
27e9691653b1bbbb6d8b8008fc33ab8f366e74f3886f9b8b1212c6c4c12af9c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD17 10628 bytes

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