Malicious PDF — malware analysis report

Static analysis result for SHA-256 41f7bde3bb74990b…

MALICIOUS

PDF

66.5 KB Created: 2021-09-20 19:20:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: eb03b7d7708976849b32d772936b901e SHA-1: 61efa60799771d39b0179a21c16173ff1a664e6f SHA-256: 41f7bde3bb74990bf5a190c8e3bc5c1d79b07bc24d2e89cd8a95882bf0fb2b57
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its image-only nature and embedded clickable link, a common tactic for distributing malware or conducting phishing attacks. The heuristic PDF_IMAGE_LURE specifically indicates this shape. While the document body is heavily obfuscated, the presence of numerous external URIs and the ClamAV detection as Pdf.Phishing.Trojan strongly suggest malicious intent. The primary attack pattern involves tricking users into clicking a link, likely leading to a malicious download or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9921

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 66 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://cegled.varosom.hu/userfiles/files/nusoduwemiwa.pdf In PDF document text
    • http://spellenindex.nl/images/uploads/59870325372.pdfIn PDF document text
    • http://bkm-market.net/userfiles/file/girumikuwinavevi.pdfIn PDF document text
    • http://machinesupplier.cn/data/product/file/2021920_1146_393.pdfIn PDF document text
    • http://amindoost.ir/images/upload/files/molagivep.pdfIn PDF document text
    • https://bachson.net/upload/file/wexoliloki.pdfIn PDF document text
    • https://ykitraders.com/UserFiles/file/89174247185.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/gasapijuveluviluje.pdfIn PDF document text
    • https://xn--80aaijz0c.xn--p1ai/ckfinder/userfiles/files/ronanemup.pdfIn PDF document text
    • http://zavalinka.by/var/upload/file/41545143261.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/a429b86d342b0bdbf726c1bf9a558227/wokij.pdfIn PDF document text
    • http://bytip.net/filespath/files/20210905123528.pdfIn PDF document text
    • http://maychaybocaocap.com/app/webroot/uploads/files/5978036521.pdfIn PDF document text
    • https://durgabas.coop.np/ckfinder/userfiles/files/97337537225.pdfIn PDF document text
    • http://dalaichau.com/files/jipeturamabama.pdfIn PDF document text
    • http://indel.sk/userfiles/file/juduvojajofob.pdfIn PDF document text
    • https://apra.pl/files/file/10800841839.pdfIn PDF document text
    • http://www.saaegfpolis.org.br/ckfinder/userfiles/files/9853296083.pdfIn PDF document text
    • http://jilienjrubin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/naderatidezeba.pdfIn PDF document text
    • http://bobiniauto.com/userfiles/file/duwijefazitumet.pdfIn PDF document text
    • https://dcimx.com/files/17492249492.pdfIn PDF document text
    • https://majubesar.org/contents/files/9209275091.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=download+speed+vpn+pro+mod+apkPDF 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://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_off0000ab58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAB58 14236 bytes
SHA-256: b089f5dacb8cfa613ee09ba8ca4ac7d0f9b05bd5ceaffba3e4687f5b9cff8e37
font_01_sfnt_off0000ce2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e641.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE641 10608 bytes
SHA-256: c8841315318e67d35035a3ac64ac6012bbc8eb211bd8e538b73a790c43a9cf3b