Malicious PDF — malware analysis report

Static analysis result for SHA-256 313ad63ff91dfaef…

MALICIOUS

PDF

72.2 KB Created: 2021-09-18 01:19:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 27789931aae58711029185bed611a063 SHA-1: ea66931e178f57444fdf1dae06443a6f15b7cab9 SHA-256: 313ad63ff91dfaefd6e05c5a9409ff1dd00a46f29f0eea529e6b054841a0820e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains a large number of embedded URLs, many of which are on disposable hosting and utilize UTM parameters, suggesting a link farm or phishing campaign. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://chcial.ru/uplcv?utm_term=watch+the+prom+online PDF link annotation
    • https://wmu24.ru/media/file/jopegoxafenizovenezu.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/hs8gjap0ptvpccm1d5hjaind68/44750012792.pdfIn PDF document text
    • http://investbuild.ru/var/upload/file/31047886369.pdfIn PDF document text
    • http://www.hgekc.com/media/userfiles/file/tujomuli.pdfIn PDF document text
    • http://kryotherapie.net/neu/userfiles/file/53884683943.pdfIn PDF document text
    • http://regmac.net/userfiles/files/fedajopibobopezozavagel.pdfIn PDF document text
    • http://landroverbh.com/ckfinder/userfiles/files/fukasobironubuxekuj.pdfIn PDF document text
    • http://cw-cut.com/uploads/file/mazidajugaxajamososiwo.pdfIn PDF document text
    • http://yetisirkaucuk.com/firma/files/midikedagufokegudemobajip.pdfIn PDF document text
    • http://abbeytraining.net/userfiles/file/pisivivavutufar.pdfIn PDF document text
    • http://moscreen.in/cmsfiles/file/97344930560.pdfIn PDF document text
    • http://preiswerte-unterkunft-papenburg.de/mediapool/41933731571.pdfIn PDF document text
    • http://say-international.eu/userfiles/file/5533730513.pdfIn PDF document text
    • https://tapetcenter.ro/app/webroot/files/userfiles/files/15353621064.pdfIn PDF document text
    • http://studiocinti.eu/userfiles/files/22627222809.pdfIn PDF document text
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/85835801016.pdfIn PDF document text
    • https://villamishkan.com/310renonew/front/images/files/kodobunuzomafiwem.pdfIn PDF document text
    • http://malir-naterac.info/UserFiles/File/bejepulibo.pdfIn PDF document text
    • https://cncunse.com/d/files/71826916686.pdfIn PDF document text
    • https://takipcisec.com/calisma2/files/uploads/51209575576.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/4e97fc5ec97738c2a0bbc895213fde62/42403088860.pdfIn PDF document text
    • http://www.aamuhsv-madisonalumni.org/files/files/13621101989.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_off0000b98f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB98F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d1a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1A6 10464 bytes
SHA-256: 22ce9fca91acff856f9b09ffd1298959d557e1f830f282f3acb08f78c4028943
font_02_sfnt_off0000e92c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE92C 16284 bytes
SHA-256: 11eca4681c2bdef127959a68db5128911f21db9da38a5da81513135ef58bc132

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