Malicious PDF — malware analysis report

Static analysis result for SHA-256 3696931be2cbe2d2…

MALICIOUS

PDF

73.3 KB Created: 2021-09-09 17:05:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5d0b0c351e1059e3087af58002628d85 SHA-1: afa8f0d9e834195752fce41dcb383594509f8a4a SHA-256: 3696931be2cbe2d26dec0f2f8e3068aa3a270e87ec27faf4a15f7f5165d794a5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with one specifically pointing to a suspicious domain that appears to be a redirector. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed as a link farm on disposable hosting, strongly suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection further confirm the malicious nature of the file.

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://allytemp.ru/uplcv?utm_term=camera+360+apk+for+android PDF link annotation
    • http://rewitex.pl/userfiles/file/wosotefisatudisofu.pdfIn PDF document text
    • http://studiofantino.it/userfiles/files/45206972341.pdfIn PDF document text
    • https://mtestbd.com/assets/uploads/files/pudekosevine.pdfIn PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/48008346577.pdfIn PDF document text
    • http://oprandi.it/userfiles/files/vifepajubelolobatawo.pdfIn PDF document text
    • http://nfc-lampang.com/user_img/files/54033916598.pdfIn PDF document text
    • https://kubermatkaplay.com/ckfinder/userfiles/files/34353363587.pdfIn PDF document text
    • https://whitepalacegrill.com/userfiles/35854773191.pdfIn PDF document text
    • https://inverpalmas.com/aym_image/files/79404054469.pdfIn PDF document text
    • https://padservhosting.com/userfiles/file/zafeka.pdfIn PDF document text
    • https://szemvidito.hu/sfwkr/feltoltesek/Images/Image/85394855216.pdfIn PDF document text
    • http://aircond.md/upload_fck/file/gosugenisafujigebamix.pdfIn PDF document text
    • http://nensi.si/upload/file/xidirovisoromiwokoban.pdfIn PDF document text
    • http://dunakeszi.varosom.hu/userfiles/files/50723409598.pdfIn PDF document text
    • http://fantacyhandicraft.com/userfiles/file/kifuxe.pdfIn PDF document text
    • https://szemvidito.hu/sfwkr/feltoltesek/Images/Image/79452785621.pdfIn PDF document text
    • http://www.dean-cpa.com/files/adminpic/file/kepenisotanaxa.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/jinubanuvurasibipesu.pdfIn PDF document text
    • https://olgunbey.com/upload/ckfinder/files/didot.pdfIn PDF document text
    • http://sushrutproctology.org/ckfinder/userfiles/files/74307473315.pdfIn PDF document text
    • http://kurier48.pl/files/userfiles/file/2520116057.pdfIn PDF document text
    • https://badoza.net/userfiles/file/43947420301.pdfIn PDF document text
    • https://twinslock.com/ckfinder/userfiles/files/fowegadikimun.pdfIn PDF document text
    • http://vipdiler.ru/files/file/gejiritelasumuse.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_off0000b9ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9AD 17380 bytes
SHA-256: 437ea05fbef83612851001cad445337071bcd364cae08358bdc9a7821de4a212
font_01_sfnt_off0000e638.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE638 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE4F 10932 bytes
SHA-256: aa134c3c509c2e548846997479c1ff15f3a036505941367400a280074f1ad24d

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