Malicious PDF — malware analysis report

Static analysis result for SHA-256 c988b0a933d3401e…

MALICIOUS

PDF

69.2 KB Created: 2021-09-28 20:24:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 78b9804cec2be20c86fba7ba954b3d55 SHA-1: db990d52497f800daf611e10ae15067417b30393 SHA-256: c988b0a933d3401e2d59f3e609dc116178e81e2eb98146a30bc795518b77dfef
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting it's used to redirect users to potentially harmful websites. The PDF structure and embedded links point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://archism.ru/uplcv?utm_term=best+monthly+budget+app+android PDF link annotation
    • http://akiisushi.com/uploads/files/79704908236.pdfIn PDF document text
    • http://originalbau.hu/imagesfiles/nejovivatogazet.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/57973359841.pdfIn PDF document text
    • http://gurgaontaxi.com/pa/trainstation/uploads/image/file/70575639562.pdfIn PDF document text
    • http://nhatnguyen.vn/media/ftp/file/zajotidizem.pdfIn PDF document text
    • http://execdentalclinic.com/uploads/ckfinder/userfiles/files/siwerazitiwalutomotifo.pdfIn PDF document text
    • http://alotercuman.com/ckfinder/userfiles/files/lupewatasarikivukolova.pdfIn PDF document text
    • http://zkqzl.com/uploadfile/file///2021091021532842.pdfIn PDF document text
    • https://philly.drinkpoint.com/uploads/files/10933034525.pdfIn PDF document text
    • http://aorganboys.handyfriendship.com/upload/files/bivivadofujazademorezil.pdfIn PDF document text
    • http://cabanagarden.hu/editor_up/73085281637.pdfIn PDF document text
    • https://digiconelectronics.com/media/jasetuzibagifigozozilotu.pdfIn PDF document text
    • http://gyermekhaz.hu/Content/site_images/files/51327172235.pdfIn PDF document text
    • https://olterus.net/contents/files/maxan.pdfIn PDF document text
    • http://corkpotters.com/images/10170847473.pdfIn PDF document text
    • http://underbutter.cz/download/foto/54296650118.pdfIn PDF document text
    • http://galettedesrois.eu/userfiles/file/53373428009.pdfIn PDF document text
    • http://gowowdeli.com/uploads/files/kuvuzodowu.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/kimamikofodizusud.pdfIn PDF document text
    • http://www.hausbaumesse.at/ckfinder/userfiles/files/10465435196.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135d26b64989---29030623273.pdfIn PDF document text
    • http://signauction.net/userfiles/file/83516172668.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/a7146d3c5cdb0a7790cbfa6ef1ef3608/42007842387.pdfIn PDF document text
    • https://tidymoney.com/ckfinder/userfiles/files/ledafifafejedis.pdfIn PDF document text
    • http://barahi.com/assets/userfiles/files/64128040461.pdfIn PDF document text
    • https://capitalsyndic.com/userfiles/file/mefexi.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://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_off0000afd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFD7 11248 bytes
SHA-256: b6b0d893a11d8cfbf173239002a3b9a88e9763218746f80218e7d8ae4eab33b9
font_01_sfnt_off0000c99a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC99A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e1ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1AC 14852 bytes
SHA-256: d57bb580e6061883eb92e37026f87c4e0feb281ca8f9a093ac2a64fd34aeb521

Open this report in the interactive analyzer, or submit your own file for analysis.