Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab23734594a4e639…

MALICIOUS

PDF

78.7 KB Created: 2021-04-01 05:32:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 828bd65210eb21b851e67ebb1bac7114 SHA-1: a8b3ec23d3c62e06753efbf5dd72ca8334582a74 SHA-256: ab23734594a4e639ade1af4756ed8bd8457fff2a5deb0d6ab47d2aa2869b3526
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one prominent link pointing to 'midufefew.ru', suggesting a phishing or malware distribution attempt. The 'PDF_SEO_LINK_FARM' heuristic indicates a large number of external links, likely to manipulate search engine results or direct users to malicious content. ClamAV also detected this as 'Pdf.Phishing.Trojan'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://midufefew.ru/aws?utm_term=what+does+palsy+mean+in+the+poem+the+canonization
    • http://gedatidigog.sportsontheweb.net/descriptive_adjectives_in_spanish.pdf
    • https://cdn-cms.f-static.net/uploads/4490266/normal_6037ed4a6599e.pdf
    • https://cdn-cms.f-static.net/uploads/4385010/normal_5feaeccb3e03c.pdf
    • https://cdn.sqhk.co/woxiwovar/ghjihdp/ark_survival_evolved_crossplay_servers.pdf
    • https://static.s123-cdn-static.com/uploads/4457011/normal_5fdd6b6a5a9be.pdf
    • https://cdn.sqhk.co/vemetafije/jfcthfy/waradugujozajifazenimas.pdf
    • https://static.s123-cdn-static.com/uploads/4465938/normal_5fde9d545ad36.pdf
    • http://zawugudumi.getenjoyment.net/pl_sql_and_mysql_difference.pdf
    • https://cdn-cms.f-static.net/uploads/4407986/normal_601855dcd3e08.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://0ca3454e-05ac-49fc-8d00-644b1af7be3c.filesusr.com/ugd/8bf3fc_42019463de424c31bcbd2bd127dd44c5.pdf?index=true
    • https://s3.amazonaws.com/fujadabez/what_is_brook_one_piece.pdf
    • http://zasuwunal.myartsonline.com/advanced_vocabulary_in_context_donald_watson.pdf
    • https://s3.amazonaws.com/kikunojulejuj/warlock_leveling_guide_classic_zones.pdf
    • https://s3.amazonaws.com/lotibabakuj/tumirogab.pdf
    • https://d8acad56-eb9a-42d1-a06c-a695c5b02328.filesusr.com/ugd/0ad6c7_c5bfe02133ba41a9a7a0c0e990c959be.pdf?index=true
    • https://s3.amazonaws.com/gofiguj/wujuvitepoloxelojok.pdf
    • https://60f6da8c-824c-4163-aae9-6195f2ac7ed4.filesusr.com/ugd/7f16bd_0864e996fe5c4d8c9d83a6ba76119dc2.pdf?index=true
    • https://s3.amazonaws.com/wolina/18133319630.pdf
    • https://s3.amazonaws.com/rogugagatuf/self_employed_cleaner_contract_template.pdf
    • https://s3.amazonaws.com/buganabowumujef/79669315163.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_off0000f49e.bin
83241419927dc857ab5fa8f4bf3425757cbd5a297420764a1ef76077227d5dcb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF49E 5384 bytes
font_01_sfnt_off000106e9.bin
5422b766fda58c2bb9b79bdfd122c47bacd7948272867836d0b1176c305f33f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106E9 10712 bytes

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