Malicious PDF — malware analysis report

Static analysis result for SHA-256 21c4557d89589071…

MALICIOUS

PDF

124.8 KB Created: 2021-03-06 16:41:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: da5fc0ac2eebe145594f98a87328782e SHA-1: 7f5cb2218787368b60f0e185121296829b443b4e SHA-256: 21c4557d89589071472fdbe27d1471efb28928a211fa3372aa1e208393c02be4
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs, with a prominent one leading to 'gimoguvi.ru', suggesting a redirection to a malicious site. The document body, though heavily obfuscated, contains text related to GPA and the wkhtmltopdf application, indicating a potential lure to disguise the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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/strik?utm_term=what+grade+is+a+2.9+gpa PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4461495/normal_5fca5b734d1b0.pdfIn PDF document text
    • http://xiwesesakuvel.medianewsonline.com/download_twilight_breaking_dawn_part_1_full_movie_in_hindi_dubbed.pdfIn PDF document text
    • https://cdn.sqhk.co/ranemagesoga/jcjggcY/74525421454.pdfIn PDF document text
    • https://lorerepurukese.weebly.com/uploads/1/3/1/4/131453396/rudewigixigixexid.pdfIn PDF document text
    • https://cdn.sqhk.co/tipefimex/FPhchcl/spiral_staircase_for_sale_cape_town.pdfIn PDF document text
    • https://boxijapemisavar.weebly.com/uploads/1/3/0/8/130874030/bakunaxaw-vidakidukenarin-mukag-sarenopapobades.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445337/normal_5fd65bd769b50.pdfIn PDF document text
    • https://gopelema.weebly.com/uploads/1/3/4/3/134314553/vimemotufo-duved-xuxomewojawovi-xepasulugoleno.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420604/normal_602270f42e2f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487431/normal_601b5f872dcef.pdfIn PDF document text
    • https://zogopovedizojux.weebly.com/uploads/1/3/1/4/131408172/31873549d54d939.pdfIn PDF document text
    • http://juwaniwabi.medianewsonline.com/tc_helicon_harmony_singer_factory_reset.pdfIn PDF document text
    • http://sazinoz.mypressonline.com/bijabiresilafuxip.pdfIn PDF document text
    • https://cdn.sqhk.co/moxoxitij/Gji1hfH/master_luxury_plastic_emulsion_price_in_pakistan.pdfIn PDF document text
    • https://cdn.sqhk.co/woledibiroju/hbiigfW/soruxikonigosalupokukat.pdfIn PDF document text
    • https://sakobapo.weebly.com/uploads/1/3/3/9/133999770/dofagipixutetadalam.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378846/normal_6037aa4c94492.pdfIn PDF document text
    • http://xatakafigudu.getenjoyment.net/what_is_drum_rudiments.pdfIn PDF document text
    • http://tonilakifak.mypressonline.com/zadujevafuximawikonuj.pdfIn PDF document text
    • https://cdn.sqhk.co/berirenike/TibhehH/5561015626.pdfIn PDF document text
    • http://zonizubiro.getenjoyment.net/66812305229.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/wemazun/zojobo.pdfIn PDF document text
    • https://s3.amazonaws.com/sepovutapakogaf/xijesazo.pdfIn PDF document text
    • https://s3.amazonaws.com/savukojubusum/vocabulary_words_for_7th_graders.pdfIn PDF document text
    • https://s3.amazonaws.com/fasomusogapovi/4505781942.pdfIn PDF document text
    • https://s3.amazonaws.com/firigugixujotov/62828289302.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_off0001ac06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AC06 5524 bytes
SHA-256: 687f56c8ee451524f7402c1f89a34f07d44bdabd105def1b9f932e471ae30059
font_01_sfnt_off0001bed7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BED7 11472 bytes
SHA-256: 0684a9979c8300bbd6f8d77683142075fc7c7d0212f540d1fdef09668cd4103d