Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a80c45d72672908…

MALICIOUS

PDF

69.8 KB Created: 2021-09-30 12:15:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b2f86b3c0a057f8648b019adf0c0b669 SHA-1: 690fb053a69adc12d1101b7d65aa64ed8605b8dd SHA-256: 1a80c45d7267290847fe3b48197b7c94339167b26c6d454bfba937546daa4dc8
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 external URIs and is identified as a link farm hosted on disposable domains, suggesting an attempt to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, preventing further analysis of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://garglob.ru/uplcv?utm_term=tribe+of+mentors+pdf PDF link annotation
    • http://thsport.dk/userfiles/file/57490239194.pdfIn PDF document text
    • http://studioguatta.it/userfiles/files/1576099581.pdfIn PDF document text
    • http://vevo.keresztessyoptika.hu/elemek/file/48299035141.pdfIn PDF document text
    • http://xn--pr3b03lcdvwu9dpynqkc.com/DATA/file/20210919170548.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/76749499217.pdfIn PDF document text
    • http://kalmi.ru/upfiles/files/samufarefanoz.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/34414358811.pdfIn PDF document text
    • http://gasasosong.com/upload/fckeditor/file/pozugolulez.pdfIn PDF document text
    • http://ndc-group.ru/uploads/files/34442095926.pdfIn PDF document text
    • http://iiiemjobs.com/FCK_Editor_Images/files/jaliturobimibisodetituxos.pdfIn PDF document text
    • https://kungfuclasshongkong.com/louis/taichi/ckfinder/userfiles/files/ravitev.pdfIn PDF document text
    • http://krzeptowski.pl/file/70580060450.pdfIn PDF document text
    • http://stroyvodservice.ru/upload/File/32863678014.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///xitibuvexogixopi.pdfIn PDF document text
    • http://hflchw.com/upload/file/75834955147.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0feddea3c---mixawez.pdfIn PDF document text
    • http://vivaldiskibus.com/FileData/ckfinder/files/20210918_64459D0C994B3D81.pdfIn PDF document text
    • http://zhongyuemedia.com/filespath/files/20210907025624.pdfIn PDF document text
    • http://wingmanplanningdemo.com/userfiles/files/4665810050.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614e4fb80a5f8---76180359453.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/66072068956.pdfIn PDF document text
    • https://kurishupally.org/userfiles/file/petif.pdfIn PDF document text
    • http://gsnursing.in/ckeditor/ckfinder/userfiles/files/juzavaxupavekebesa.pdfIn PDF document text
    • http://madveras.com/ckfinder/userfiles/files/60232574916.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_off0000b2af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2AF 10552 bytes
SHA-256: 4d60ac18c33e2bd798b1280f107e5c18b33d7e386c149acb73eb9f629073dc5e
font_01_sfnt_off0000ca7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e28d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE28D 15432 bytes
SHA-256: 0cd248972d5bb1c9f1896b21f02b4dfd1411360a9183e739feb63253b6f8f9cd