Malicious PDF — malware analysis report

Static analysis result for SHA-256 37ab53415f3c971e…

MALICIOUS

PDF

79.7 KB Created: 2021-09-12 06:25:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 49068ba78c51ae5e507523bc03341423 SHA-1: f6a8033fc33a92c84be2d4cc5f2a3c955dd8f4b9 SHA-256: 37ab53415f3c971e54c5b8849da7b8350336b5ba804542114e5288875acba7be
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to disposable domains, indicative of a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites, often employing JavaScript for obfuscation or further redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://inwebjor.ru/uplcv?utm_term=wifi+warden+pro+premium+apk PDF link annotation
    • https://dulsuc.cl/userfiles/file/terejosajawixoz.pdfIn PDF document text
    • http://101-games.ru/images/uploads/files/maxituvejobovujowedexirez.pdfIn PDF document text
    • http://almawred-sy.com/files/adminfiles/files/95632081770.pdfIn PDF document text
    • http://cjatkinson.com/userimages/52108841016.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/zefatefebizonaxodapuxax.pdfIn PDF document text
    • http://jinruily.com/UploadFile/file/20210912084851716.pdfIn PDF document text
    • http://varosom.hu/userfiles/files/98909780994.pdfIn PDF document text
    • https://traffictkt.com/viking1/uploads/files/6795097060.pdfIn PDF document text
    • https://fontan-montag.ru/img/upload/79766552210.pdfIn PDF document text
    • https://booking-news.hkdnracing.com/webroot/editor-uploads/files/39534413068.pdfIn PDF document text
    • http://vuason.vn/upload/files/wufopenijogiwitefifikija.pdfIn PDF document text
    • http://fecirturizm.com/resimler/files/wexow.pdfIn PDF document text
    • https://pastravariaizvoarelebratiei.ro/images/file/3814272522.pdfIn PDF document text
    • http://stylekd.ru/files/63655404410.pdfIn PDF document text
    • http://imreelectric.sk/uploads/file/15566046520.pdfIn PDF document text
    • https://alajuusa.ee/media/contents/file/nebavofizagewizusi.pdfIn PDF document text
    • http://jumpinfit.it/userfiles/files/96490407600.pdfIn PDF document text
    • https://crc.creativechange.net/ckfinder/userfiles/files/varapufatefenupibawu.pdfIn PDF document text
    • https://comtraining.cl/userfiles/files/rodegozixadogedizawaj.pdfIn PDF document text
    • http://www.beautyvogue.ch/Files/file/nazak.pdfIn PDF document text
    • http://crestviewshopping.abwingsmd.com/uploads/files/fimoxawifejumu.pdfIn PDF document text
    • http://ffarchitettura.it/userfiles/files/27392087974.pdfIn PDF document text
    • http://chinhsuasolieu.com/media/files/bonumonen.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/rusivi.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_off0000cfed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFED 18804 bytes
SHA-256: 05fa81b6b12073940b90201521b5a9dcf8ea3bd71a52bb095ebd028c7389ec15
font_01_sfnt_off0001011e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1011E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011935.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11935 10620 bytes
SHA-256: 4bdb39849795f9507095db8d8551747782c78f7248be3c3521690d81b3ad7a55

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