Malicious PDF — malware analysis report

Static analysis result for SHA-256 43cb7df7ba8e3865…

MALICIOUS

PDF

77.3 KB Created: 2021-03-09 03:14:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 9259eddb0ee044d4d1010fc9c32092de SHA-1: 93cccfe2f9eed4eea70a863ade013adf0d05c2fa SHA-256: 43cb7df7ba8e38650dbed6a8263408fc53ef9c404706c8f03b4e0091a71a25b9
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 pointing to disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://jacksth.ru/award?keyword=bolero+piano+sheet+music+pdf PDF link annotation
    • http://fullpisetc.ru/54109660953srjmh.pdfIn PDF document text
    • https://cdn.sqhk.co/loxusovi/cjehizI/kathy_rain_briefcase_code.pdfIn PDF document text
    • http://kprovk.xyz/410793270795uoos.pdfIn PDF document text
    • https://cdn.sqhk.co/ponajadu/richfs4/73384231361.pdfIn PDF document text
    • https://cdn.sqhk.co/redusebi/hELpgdn/33981342935.pdfIn PDF document text
    • http://kadufepofawimer.iblogger.org/garmin_nuvi_1390_sd_card_format.pdfIn PDF document text
    • http://ndfnasg.xyz/65385873916tr3nk.pdfIn PDF document text
    • https://cdn.sqhk.co/sabiwizi/ibge8hd/dialog_sri_lanka_top_up.pdfIn PDF document text
    • http://sedovarubabozop.iblogger.org/paded.pdfIn PDF document text
    • https://cdn.sqhk.co/tawibonikigo/cheCjap/dungeons_and_dragons_online_freezing.pdfIn PDF document text
    • https://cdn.sqhk.co/segidexu/Zejcjeq/icse_class_9_physics_syllabus_2019.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/17be8fd3-d3c5-4058-8cfa-16e4b5d95c81/rojegisope.pdfIn PDF document text
    • http://befokube.rf.gd/wujafaganubovazonasokobo.pdfIn PDF document text
    • https://7a9095e9-4ba3-4ff7-9406-a75d0382ce8a.filesusr.com/ugd/db93e9_1dd7f2c4803747c592ab93a932b9815a.pdf?index=trueIn PDF document text
    • https://d5bea983-5bca-41ba-aae6-6b688785cc77.filesusr.com/ugd/9ec29b_5bc910367ae7485793f027a48c72c80f.pdf?index=trueIn PDF document text
    • http://wememone.rf.gd/lit_ebook_reader_apk.pdfIn PDF document text
    • https://5c09c65f-4728-49e3-9562-8692e696fc4f.filesusr.com/ugd/32acb1_c0b1b6435781411bbc1c24708a8ea5ec.pdf?index=trueIn PDF document text
    • https://d451e762-8e00-4155-9971-9512d28d2528.filesusr.com/ugd/b52961_b91b1b2a3fbf41fdb33328e019e77467.pdf?index=trueIn PDF document text
    • https://80820154-e864-4b0c-832b-212b24169927.filesusr.com/ugd/c12414_5f8f84bec3064372ae87c3fb4394fb00.pdf?index=trueIn PDF document text
    • http://zuzimekot.rf.gd/jajowupiwigudaximivukol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9516f99b-e62f-4f91-b60d-1f594ce89cf6/how_to_observe_salatul_istikhara.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f188.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF188 5444 bytes
SHA-256: 8ba36ac368724b211040d94f51bfd50f6743d32e6f62d97daf6a49d93c05e3b1
font_01_sfnt_off000103de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103DE 10412 bytes
SHA-256: b171390b186c744577181b49da543118d2644aef73ee27ee63bbd34e68734001

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