Malicious PDF — malware analysis report

Static analysis result for SHA-256 2100cabfd1239dd5…

MALICIOUS

PDF

80.9 KB Created: 2021-03-01 09:32:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 26559c83d4637d9a43885e92e121f33b SHA-1: 5d7bc3d7f96321466a429f17e78f7c78639425e5 SHA-256: 2100cabfd1239dd55e7468deed4076c36f6aa46ef45cec2cf1caf06705c174e9
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, many of which are flagged as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious sites.

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://maypoin.ru/strik?utm_term=que+son+los+tipos+de+funciones+matematicas PDF link annotation
    • http://prizinsta365.website/53475992426ykhwk.pdfIn PDF document text
    • http://gexomafe.mypressonline.com/3.5_ranger_prestige_classes.pdfIn PDF document text
    • http://nebemor.mywebcommunity.org/16468864230.pdfIn PDF document text
    • https://sowobufujugazid.weebly.com/uploads/1/3/0/8/130873997/tovagune-federeda-vokodekajilav.pdfIn PDF document text
    • https://sizamuvexiluti.weebly.com/uploads/1/3/4/6/134644091/lakokafeveno.pdfIn PDF document text
    • http://uscreditreport.info/93690586736yhr9z.pdfIn PDF document text
    • http://kigumelez.medianewsonline.com/hillsborough_county_school_calendar_2018.pdfIn PDF document text
    • http://xejepurefe.scienceontheweb.net/44464183009.pdfIn PDF document text
    • http://fafesixokegigi.getenjoyment.net/sovexodevuvavujobume.pdfIn PDF document text
    • https://werumitepoli.weebly.com/uploads/1/3/0/7/130739038/movumezolisalep.pdfIn PDF document text
    • http://miribut.mywebcommunity.org/30609788405.pdfIn PDF document text
    • http://vsspb.ru/fovelogitesavivuo4kiu.pdfIn PDF document text
    • http://zoomita.space/enemy_pie_read_aloud_storyline_onlines3bzo.pdfIn PDF document text
    • https://xutepodufolesik.weebly.com/uploads/1/3/0/7/130739265/8211649.pdfIn PDF document text
    • http://toppiksnack.xyz/ruzofaturov02a4b.pdfIn PDF document text
    • https://kunefenirubineb.weebly.com/uploads/1/3/0/7/130739500/vogobanuzadif-metevub-runobot-vuwelova.pdfIn PDF document text
    • http://jedomagisuw.getenjoyment.net/rosudajiboxatokuwiritex.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sutexuvidag.myartsonline.com/vegetarian_food_recipes_without_onion_garlic.pdfIn PDF document text
    • http://nejesezape.myartsonline.com/8723830816.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_off0000e72c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE72C 5268 bytes
SHA-256: 78e4871eeaac79e4329ee1834b305bb28e7f5fa662fca187429ca5317f7b1548
font_01_sfnt_off0000f90a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF90A 11396 bytes
SHA-256: c6d98bbb622908014ecf42151668139f13c9f01a558764216b2545119238b865
font_02_sfnt_off00011e25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E25 16312 bytes
SHA-256: 531e37f64a2e7dc3bfb257675d9e6c644c7b1597f33ba9a969cd005a7ed65660

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