Malicious PDF — malware analysis report

Static analysis result for SHA-256 90c9afc9713958df…

MALICIOUS

PDF

68.4 KB Created: 2021-09-24 17:02:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 18a453d3dbeb97118ee26d1af374fca2 SHA-1: dc1d345ad93f2443f570c9b5cfd1a0b3f55ab4b7 SHA-256: 90c9afc9713958df4248c01572c129dd8e8d95189cd4aa696cd3e26d0de6eca5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous disposable domains, which is a common tactic for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content.

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://pisangmanis.com/contents/files/48706438617.pdf In PDF document text
    • http://kleinschadenexpert.com/userfiles/file/tuvixazufupud.pdfIn PDF document text
    • http://elijasprojekts.lv/files/file/fedesowedovufud.pdfIn PDF document text
    • https://karolinanowak.com/userfiles/file/domar.pdfIn PDF document text
    • https://plantbiochem.com/ckfinder/userfiles/files/vemiraj.pdfIn PDF document text
    • http://pokebarslo.com/uploads/files/wegokusaridojemazemuf.pdfIn PDF document text
    • http://kwong-cheong.com/userfiles/pajepitigojuvejidofafawag.pdfIn PDF document text
    • https://mamalight.net/business_school/uploads/file/tevok.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/97897520447.pdfIn PDF document text
    • https://s-serviss.lv/userfiles/file/nevafalikokiwaxelekelet.pdfIn PDF document text
    • https://capital-publishing.com/ckfinder/userfiles/files/22002463528.pdfIn PDF document text
    • http://hoanhaochemical.com/uploads/files/460938457.pdfIn PDF document text
    • http://pusheng168.com/uploadfiles/20210902172232.pdfIn PDF document text
    • http://mgbig.com/upload_fck/file/2021-9-23/20210923052122281618.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1614090eb81460---meruzirajogesewu.pdfIn PDF document text
    • http://dribblebar.pl/userfiles/file/41436077391.pdfIn PDF document text
    • https://tideandtigers.com/ckfinder/userfiles/files/10811740125.pdfIn PDF document text
    • http://vanguardhungary.hu/userfiles/file/kupek.pdfIn PDF document text
    • http://mebco.ru/images/file/49696163308.pdfIn PDF document text
    • http://dopuskvsro.ru/UserFiles/45386555315.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/10425517302.pdfIn PDF document text
    • http://roletyhanarol.pl/files/file/32162993203.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/jizekikotopuwepaborixa.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/tunipovebel.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///ditovorajopizowot.pdfIn PDF document text
    • https://playerpress.com/ckfinder/userfiles/files/92872615712.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=online+pdf+to+pptPDF link annotation
    • 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_off0000b046.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB046 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c85d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC85D 10088 bytes
SHA-256: 997081eb9edd4b70f54b67b000d8f5bebb5f0616e337b874fc0ceae058539152
font_02_sfnt_off0000dee3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE3 14868 bytes
SHA-256: 37f2753ba216f17163d56db7fceb81276698780f1b995509c7ada68676895540

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