Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab1a5f742bc080a9…

MALICIOUS

PDF

80.8 KB Created: 2021-10-05 08:58:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 3565a045d2d4d69aeac8dc3bacd34b00 SHA-1: a96ee47caac2396dbdf56580a5d0ccb2c7b6949b SHA-256: ab1a5f742bc080a99b796160ec245c0353e73dade488ae3903357dda77f62c57
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier with high confidence. It contains numerous embedded URLs, many of which point to PDF files hosted on potentially disposable domains, suggesting a link farm or phishing lure. The presence of a 'download button' heuristic further supports the phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://lorrainezammit.com/files/file/90430703587.pdf In PDF document text
    • http://www.polni.si/Images/files/29092163510.pdfIn PDF document text
    • http://tehpromyar.ru/media/file/jorubonevi.pdfIn PDF document text
    • http://aburobocon2019.mnb.mn/uploads/files/kozatedigomigaxorem.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614dc980becc2---bapafadotorimurope.pdfIn PDF document text
    • https://pensiunea-escape.ro/ckfinder/userfiles/files/nawefezuwosexedeweviwiv.pdfIn PDF document text
    • http://fireprovietnam.net/luutru/files/36234007764.pdfIn PDF document text
    • http://xn--80aaaghhaztbcd1agjgbccsgfftf.xn--p1ai/pict/file/javogiradisitizibi.pdfIn PDF document text
    • http://worshipedia.mobi/sites/default/files/file/98463948978.pdfIn PDF document text
    • http://domadoma.cz/userfiles/file/66814708221.pdfIn PDF document text
    • https://avenue102.com/uploads/file/67783078945.pdfIn PDF document text
    • http://abwcrainhwy.com/uploads/files/lugadotolakefomupi.pdfIn PDF document text
    • http://lisaarkin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/5501998105.pdfIn PDF document text
    • http://www.americaninvest.net/upls/files/kupemuvajometawinukur.pdfIn PDF document text
    • http://119pump.net/d/files/43310743217.pdfIn PDF document text
    • https://bold-iot.com/uploads/files/202109071320094038.pdfIn PDF document text
    • http://mywymc.com/userfiles/file/79241369782.pdfIn PDF document text
    • http://kinel-hunter.ru/upfiles/file/vivoxuxabodubej.pdfIn PDF document text
    • http://somkuthyoptika.hu/editor_up/187536342.pdfIn PDF document text
    • http://garankuccu.com/upload/fckimagesfile/aeaf7f5a09cfcfaa7b317ea35e52f3ef.pdfIn PDF document text
    • http://quantri.thaisonpalacehotel.com/upload/files/vugisek.pdfIn PDF document text
    • http://bamila.vn/luutru/files/73962181342.pdfIn PDF document text
    • http://kezheng.net/Upload/file/vivavotodugosajapux.pdfIn PDF document text
    • http://zaintik.org/files/galeria/files/29927285367.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=army+ssd+4+answersPDF 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_off0000d1f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1F9 20076 bytes
SHA-256: a2aaaf213380d54a47d15755630fb4e68be58b71496067d4405436bf6d12c487
font_01_sfnt_off000106ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ec4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC4 10312 bytes
SHA-256: 081ed60df5a7888f431542f9244bb0900924a3284d163c52160aeb994e7e80ff