Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bc70d1786897dbe…

MALICIOUS

PDF

88.3 KB Created: 2021-09-09 11:15:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 72459488d3f5ad7578a1e492c0920aec SHA-1: b4689132e4dd5cd8ece7e332e169d1ff4515376c SHA-256: 6bc70d1786897dbe94e7f1dac0d5c2f8a15753c7f3698cdc2b4c95aa364d64ef
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 a large number of embedded URLs, many of which point to disposable hosting or redirectors, indicating a likely attempt to distribute malicious content or phish for credentials. The authoring application 'wkhtmltopdf' suggests it may have been generated programmatically to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://queure.ru/uplcv?utm_term=comment+filmer+son+%C3%A9cran+android PDF link annotation
    • http://arisutour.com/ckupload/files/82609347279.pdfIn PDF document text
    • http://shriramashramssschool.org/userfiles/file/biruxabumikeforokoj.pdfIn PDF document text
    • http://canoeing.by/pics/files/69908312211.pdfIn PDF document text
    • http://elcolono.net/userfiles/files/tunijanoratugabuzubuke.pdfIn PDF document text
    • https://ispartaprefabrik.com/ckfinder/upload/files/85285677809.pdfIn PDF document text
    • http://2016.letnifestiwal.pl/ckfinder/userfiles/files/38617953236.pdfIn PDF document text
    • http://webcertain.asia/contentupload/fckeditorUploads/organization_/file/95441007903.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613010087413a---solaxatoxapuw.pdfIn PDF document text
    • https://weddingitaly.jp/images/file/pozufus.pdfIn PDF document text
    • http://dreiseengrundschule.de/files/82948959710.pdfIn PDF document text
    • http://avon-bratislava.sk/files/files/namavikavabokugize.pdfIn PDF document text
    • https://toocapen.com/files/78313863194.pdfIn PDF document text
    • https://bor-diing.com/upload/files/66131546508.pdfIn PDF document text
    • http://hawaiianhunareiki.it/file/18468880323.pdfIn PDF document text
    • https://koltoztetes-szallitas-lomtalanitas.com/ckfinder/userfiles/files/pawepirev.pdfIn PDF document text
    • https://jin-hung.com/userfiles/file/21358600960.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/mumena.pdfIn PDF document text
    • http://nwhouse.ru/uploads/file/juvowokujobafabo.pdfIn PDF document text
    • http://study4student.com/cache/fck_files/file/gedaxona.pdfIn PDF document text
    • http://cisseo.net/userfiles/files/11626497555.pdfIn PDF document text
    • http://gizmakina.com/depo/sayfaresim/file/66650907442.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/161346a34d0a02---51466352452.pdfIn PDF document text
    • http://consade.com/userfiles/file/jikubutavogalurizajama.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/jasunavanezox.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_off0000ea89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA89 10820 bytes
SHA-256: d121a0593391892eefe56f02a832ce86ae24f55c5e7a29da43d1046432784ee6
font_01_sfnt_off0001032b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1032B 21188 bytes
SHA-256: 23ef65ddb562be7dfafd666c080f80a96f6404002db535c22c128ad313317bf9
font_02_sfnt_off00013926.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13926 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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