Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8307cf53c9aacf1…

MALICIOUS

PDF

80.9 KB Created: 2021-04-28 12:31:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: ab220aa35a68180e34bdb1afbd3931d2 SHA-1: c6608e7dac4f7bb8b18bc5a79273cf084712e19d SHA-256: d8307cf53c9aacf18dcd2a5943ca9d1be396059082f6ac03ed9a05fa83c94f64
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 embedded URLs, many pointing to disposable domains, suggesting a link farm or redirection scheme to host malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a large number of links on potentially untrusted hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://botokaw.ru/strik?utm_term=how+to+reduce+screen+size+on+macbook+air PDF link annotation
    • http://xulazawelinuze.scienceontheweb.net/beginner_bodybuilding_workout.pdfIn PDF document text
    • http://onlinetiser.website/vosevulabugmphuu.pdfIn PDF document text
    • https://cdn.sqhk.co/febapaji/jg3fgii/4848916738.pdfIn PDF document text
    • http://atlas-copco.su/vosepikuwixazoravdl0.pdfIn PDF document text
    • http://gladkoe-telo.xyz/fukilabupulekiwema07qk4.pdfIn PDF document text
    • https://cdn.sqhk.co/poxosafixe/bOjiJjh/leech_fishing_report.pdfIn PDF document text
    • http://zoosalon.org/kufujosajekezaguvogodup2n4jf.pdfIn PDF document text
    • https://cdn.sqhk.co/limizolaxa/ahd1fib/christmas_shopping_delivery_slots_2020.pdfIn PDF document text
    • http://everydays.space/what_are_the_rainforest_plants95nf7.pdfIn PDF document text
    • http://fewudutizoxom.medianewsonline.com/what_food_has_alkaline_phosphatase.pdfIn PDF document text
    • http://zipubezexupoka.mywebcommunity.org/important_events_from_1700_to_1800.pdfIn PDF document text
    • http://smilex.club/tetuzixibuxufepi2gzij.pdfIn PDF document text
    • http://jinaxewujabiwez.22web.org/sanafewapinaxosubowofulu.pdfIn PDF document text
    • http://banademebilite.sportsontheweb.net/82843006538.pdfIn PDF document text
    • https://cdn.sqhk.co/dodalowogiv/nwicjeV/creative_approaches_to_problem_solving.pdfIn PDF document text
    • https://cdn.sqhk.co/kafekata/jhehaRh/9_innings_pro_baseball_2011_descargar.pdfIn PDF document text
    • http://melivoxigozige.mypressonline.com/62724347051.pdfIn PDF document text
    • http://instapriz.online/does_primerica_pay_for_licensing4bh8f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lapafat.rf.gd/56173423785.pdfIn PDF document text
    • http://jepameji.rf.gd/post_malone_feeling_whitney_piano_sheet_music.pdfIn PDF document text
    • http://jumebesatupa.epizy.com/punctuation_exercises_esl.pdfIn PDF document text
    • http://varirojemixu.myartsonline.com/apc_1kva_ups_datasheet.pdfIn PDF document text
    • http://rapodebo.epizy.com/wapelotujekaguxisase.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e86a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE86A 5360 bytes
SHA-256: c8ea95b857a0a4f024b5f81f8770b1a1878c121280eebd172828df72be95f400
font_01_sfnt_off0000faa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA5 11084 bytes
SHA-256: 2ab9c087805b40d4b4be532b7bf9a1b6daeb769715b54f1e4d20e8d1887db21d
font_02_sfnt_off000120dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120DD 16060 bytes
SHA-256: 4471f92216f50ed59660dfde07325d7bc7936b356a877ae20405b399f7876638

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