Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0907e0a87d419f3…

MALICIOUS

PDF

72.2 KB Created: 2021-02-24 01:26:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 392bf243e66593dbb644ab91ab04e950 SHA-1: 55d4651d2cdb8fcd38a86b3f67a06a4c62ba8e55 SHA-256: d0907e0a87d419f30d5014a849e094e9a0088651bf05ec988ffd20acd58ed63e
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, suggesting it is part of a link farm designed to drive traffic to potentially malicious websites. One of the primary URLs extracted, 'https://baarspo.ru/wix?keyword=law+of+sines+and+law+of+cosines+worksheet+answers+practice+b', appears to be a lure for users searching for educational content, which is a common tactic for 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://baarspo.ru/wix?keyword=law+of+sines+and+law+of+cosines+worksheet+answers+practice+b PDF link annotation
    • https://cdn.sqhk.co/duxadikoti/fxqbidl/6833103711.pdfIn PDF document text
    • https://cdn.sqhk.co/pumibavi/WtISggo/jisumelexis.pdfIn PDF document text
    • https://cdn.sqhk.co/mopomotop/bzdjd7T/55996210825.pdfIn PDF document text
    • https://cdn.sqhk.co/xebosulog/5zqYPFu/67371474089.pdfIn PDF document text
    • http://50offshop.info/mild_intermittent_asthma_guidelines5pegf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453333/normal_600c774b00e10.pdfIn PDF document text
    • https://cdn.sqhk.co/zuvifilezaja/fphcihj/boss_fight_games_online.pdfIn PDF document text
    • https://cdn.sqhk.co/zikufivol/0geXihq/nemixad.pdfIn PDF document text
    • https://jaroxifapo.weebly.com/uploads/1/3/1/6/131636664/gojawebigaju-sejamexosuxitu.pdfIn PDF document text
    • https://cdn.sqhk.co/posogamumut/JjbihM9/magic_cleaner_for_whatsapp_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420761/normal_6010678169d94.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481662/normal_601e1f82930a2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sizadagazagaj/play_store_app_on_my_laptop.pdfIn PDF document text
    • https://s3.amazonaws.com/dowesitobuga/gikixuromuvavezalubobuz.pdfIn PDF document text
    • https://s3.amazonaws.com/fotepopunaj/44713081862.pdfIn PDF document text
    • https://s3.amazonaws.com/degisapemifa/citra_3ds_android_emulator.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_off0000df99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF99 5480 bytes
SHA-256: 9374bafec6aa7fda53935bf919ebb37728c424da5e7fee11f42e96fab98bb537
font_01_sfnt_off0000f24b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF24B 9616 bytes
SHA-256: 66e6ba39e52aac57e4f11af9862c38978ffac07be3a703afa58233a61777978c

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