Malicious PDF — malware analysis report

Static analysis result for SHA-256 844cb233141b90f9…

MALICIOUS

PDF

78.1 KB Created: 2021-02-14 01:36:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: e6a8fc2af00943f85ec805ce923bc1a2 SHA-1: c20ff539ec10a358356382c3064ca35430af37dd SHA-256: 844cb233141b90f96dea299e87c2e8da21a46e1e812b2a33a1681134f120dd04
156 Risk Score

Malware Insights

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

The PDF file contains a heuristic indicating it is part of a link farm, with numerous external PDF links, one of which is http://vazojebimuvap.epizy.com/gegobiregikomo.pdf. The document body, though heavily obfuscated, suggests a lure related to an 'Algebra 1 summer packet answer key' and contains an external URI pointing to https://seumenha.ru/123. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://seumenha.ru/123?utm_term=algebra+1+summer+packet+answer+key PDF link annotation
    • https://giloxegikejuzun.weebly.com/uploads/1/3/4/7/134712531/c98131787a6ca.pdfIn PDF document text
    • https://futinenapol.weebly.com/uploads/1/3/1/4/131438538/kosamomu_pifedudak_tefuxufazilim_nojifi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419430/normal_6023c642ecf15.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447641/normal_6001718c17438.pdfIn PDF document text
    • https://nukanomipixi.weebly.com/uploads/1/3/2/7/132740264/2265273.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475571/normal_5ffacb7b05640.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374185/normal_5fc917492e7a0.pdfIn PDF document text
    • https://cdn.sqhk.co/nezupusovefi/Ogfvjhf/fut_draft_maker_20.pdfIn PDF document text
    • https://cdn.sqhk.co/zivugeri/gf55Mje/gazatenoz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486036/normal_60204be9193ad.pdfIn PDF document text
    • https://babuzusevajuwo.weebly.com/uploads/1/3/4/8/134878483/89ee619cd7f.pdfIn PDF document text
    • https://dipidedi.weebly.com/uploads/1/3/2/8/132815933/gojosifu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vazojebimuvap.epizy.com/gegobiregikomo.pdfIn PDF document text
    • https://s3.amazonaws.com/pukiza/emulator_android_pokemon_go.pdfIn PDF document text
    • https://s3.amazonaws.com/viregujipowuru/gizimozexonelazasazigu.pdfIn PDF document text
    • https://s3.amazonaws.com/wovedukevikov/13248588320.pdfIn PDF document text
    • http://fupuvafibip.rf.gd/27836961276.pdfIn PDF document text
    • https://s3.amazonaws.com/toguvaju/shatta_wale_borjo_mp4_video.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_off0000f3dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3DC 5692 bytes
SHA-256: 2c12bc5c357e3c4018f636a716d3401116d11f5278c251db31af068fda6b94d5
font_01_sfnt_off00010751.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10751 10592 bytes
SHA-256: 9521ea8ddb8c5f019eac023e5954b4550d71969c83276dc01a039c821ec8c972

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