Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd044eb688d8b8ed…

MALICIOUS

PDF

84.7 KB Created: 2021-09-18 21:13:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9d2a649afafac6e374b81194e893dea5 SHA-1: 0ab14eb105581f8c1da40d75fcddeb321773b6a7 SHA-256: dd044eb688d8b8edfbfcb3755119807c5ab92b490482c6112c056ef1228154a3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URIs pointing to disposable hosting, suggesting a phishing or malware distribution scheme. The presence of multiple URLs, including those with 'utm_term' parameters, indicates an attempt to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://philabc.ru/uplcv?utm_term=fifa+ultimate+team+app+android
    • https://e-tta.com/app/webroot/userfiles/files/regidikupufugafepoxigawap.pdf
    • http://drthchowdary.net/userfiles/file/97035094803.pdf
    • https://www.borzabadi.com/ckfinder/userfiles/files/40168823462.pdf
    • http://chocoenglish.com/_UploadFile/Images/file/bebabapuba.pdf
    • http://sromedical.com/file_media/file_image/file/83280962297.pdf
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613deb16ad112---67700161187.pdf
    • https://tekmaker.com/upload/files/binuj.pdf
    • http://arablift.net/userfiles/file/kapozofirokedivemitome.pdf
    • http://ks4073.com/file_media/file_image/file/rewivonogusojexivafilugo.pdf
    • http://taaltoetsvo.nl/userfiles/file/97124311020.pdf
    • http://files.ibiza-ferien.de/file/71599599679.pdf
    • http://123podkrovie.sk/editor_uploads/files/76789244792.pdf
    • http://gibisch.biz/files/files/93740229622.pdf
    • https://totalsewa.com/userfiles/file/paberabositoxunawif.pdf
    • http://www.kickcommerce.com/userfiles/file/jipuvapu.pdf
    • http://ukrfirework.com/images/file/gupajulisek.pdf
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef0a1bcbdd---57724710285.pdf
    • http://goldnumber.info/userfiles/file/68043058629.pdf
    • https://megacook.pt/site/upload/file/86243613789.pdf
    • http://ucg-eg.com/userfiles/file/nixebinasuja.pdf
    • http://doubles301.jp/files/ckeditor/files/86382928911.pdf
    • http://gpszone.hu/upload/userfiles/file/89983761224.pdf
    • https://rainbowfurnitures.com/files/files/zavakatobinowemikevem.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e46a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE46A 16792 bytes
font_01_sfnt_off0000fc81.bin
c280064d3fc884504db6924cf8343366e3d54c3474ba7778c231f7093fca2929		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC81 10568 bytes
font_02_sfnt_off0001147d.bin
56a8e4aee8150e3d8ac6fed7817e7e7c19c7f08630bfd31f37d4976746e8c8a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1147D 18532 bytes

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