Malicious PDF — malware analysis report

Static analysis result for SHA-256 d51bbadcf61fceb4…

MALICIOUS

PDF

74.2 KB Created: 2021-02-28 07:10:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 01e2b4cef79f0f473f2fb1323703981c SHA-1: 763da97ca8006c33eafc208538198e9e28aba884 SHA-256: d51bbadcf61fceb48720a4cb22101bac496b228b3940f8cded59fc69041c5a31
126 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting and are likely part of a link farm designed to redirect users to malicious content or downloads. The document body, though heavily obfuscated, appears to be a lure related to calculating 'watts per square meter', which is likely a pretext to disguise the malicious intent.

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 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://gimoguvi.ru/aws?utm_term=how+to+calculate+watts+per+square+meter PDF link annotation
    • https://cdn.sqhk.co/bavozazav/Czje9hi/download_double_head_shark_attack_multiplayer_mod_apk.pdfIn PDF document text
    • http://powajaxib.medianewsonline.com/how_to_respond_to_a_good_review_at_work.pdfIn PDF document text
    • https://cdn.sqhk.co/boxewemutox/gihhvLZ/dhoom_2_full_movie_online_watch_and_download.pdfIn PDF document text
    • http://replyua.site/prepositions_of_place_exercise_grade_6g366j.pdfIn PDF document text
    • http://rozujed.sportsontheweb.net/thank_you_reply_email_for_appreciation_sample.pdfIn PDF document text
    • http://calipshatngaccs1.xyz/1.3_equivalencia_y_diagrama_de_flujo0wbbx.pdfIn PDF document text
    • https://cdn.sqhk.co/nifodotiriru/iacH6SZ/wubakisidiradawiloku.pdfIn PDF document text
    • https://cdn.sqhk.co/naziwixolagu/ga5Zs3V/oxford_united_hospitality_tickets.pdfIn PDF document text
    • http://pogawubujogeje.mypressonline.com/20058489546.pdfIn PDF document text
    • http://dosijefa.mypressonline.com/2016_buick_lacrosse_owners_manual.pdfIn PDF document text
    • http://feyakast.online/142973749524jgiv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vilatelisoto.onlinewebshop.net/gufoboxarimuturuwaku.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_off0000e592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE592 5256 bytes
SHA-256: 873154f735d87348da015a834094db5278eed95cf2f964cbfad506616bac59a2
font_01_sfnt_off0000f772.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF772 10640 bytes
SHA-256: 6ffe56287d1bc1141eead82f63b1c8f7d245cb3630fd9b1f0f10ea78feeef92f

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