Malicious PDF — malware analysis report

Static analysis result for SHA-256 b53cd91e49d2c79e…

MALICIOUS

PDF

85.6 KB Created: 2021-09-12 15:29:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0168ab9701a88ca07cf8bd35740b107c SHA-1: 0928fbb500435502761c86e2b5b18a24fc2eddf9 SHA-256: b53cd91e49d2c79eeb8136214b2301e658fbc33586af2aa24e6830d73b5ab3ae
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various domains, suggesting a link farm or redirection scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using disposable hosting for a large number of links, likely for SEO manipulation or to obscure malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://sevennews.com.br/ckfinder/userfiles/files/28896542471.pdf
    • http://driver-jazda.pl/upload/file/85472695949.pdf
    • https://solidpractise.com/files/userfiles/file/41858334811.pdf
    • https://academiapreprod.riportico.com/userfiles/files/98711979928.pdf
    • http://www.huntsvillepr.com/files/files/dasowubegisovurajoz.pdf
    • https://groupburuemas2.com/contents/files/koramazamifodowezagusa.pdf
    • https://blokhol.com/upload/files/tigomokexeburos.pdf
    • http://hcvitamin.com/webroot/img/files/55071767901.pdf
    • http://haustechnik-hagenauer.at/93773229853.pdf
    • https://hamasataccessories.com/userfiles/files/37109329035.pdf
    • https://sanipro.ma/app/webroot/uploaderfiles/10053127517.pdf
    • https://shindah.com/images/ckeditor_img/files/xegafivovab.pdf
    • https://khonggiansachhanoi.vn/uploads/files/18289820658.pdf
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16137b4b535b4a---lekinatifomujerurugakuko.pdf
    • http://solemarservizi.it/userfiles/files/34857197542.pdf
    • https://perfectprojects.ro/userfiles/file/vumila.pdf
    • http://studiogalata.it/userfiles/files/62028150649.pdf
    • http://fobas.cz/userfiles/file/63714824781.pdf
    • https://techinnsrl.com/writable/public/userfiles/file/jogufejabedumedewur.pdf
    • http://ptichile.cl/userfiles/file/pawibupogoxidipeniwemam.pdf
    • http://kaies.cn/upfiles/file/xureluwug.pdf
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac1bea93a8---48995723703.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=agatha+christie+books+in+tamil+free+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e490.bin
32a204af3f2438a0757d09dd1ecfecec88baff122e26c05d95053755ccd2de34		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE490 11220 bytes
font_01_sfnt_off0000fe84.bin
dff2e6c9938a1e1e91641991ef45d3817786acf1a95aed852ee42cfab85adb54		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE84 19208 bytes
font_02_sfnt_off0001305e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1305E 16792 bytes

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