Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa0d58db7ff5ccc6…

MALICIOUS

PDF

70.8 KB Created: 2021-09-17 18:13:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b2dd4d81d9fc2c367a68db886dd9b42d SHA-1: a519b2866d53ba4bbb029eeed31a8de19c679e98 SHA-256: aa0d58db7ff5ccc63fc5103f18842f55a564689d51ae0cb8afbad5347b613a04
126 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, indicating malicious intent. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting it's used to redirect users to potentially harmful websites. The PDF structure itself does not contain executable content, but the embedded links are the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://cructi.ru/uplcv?utm_term=best+brain+and+puzzle+android+games PDF link annotation
    • https://lecachet.fr/docs/files/45768968829.pdfIn PDF document text
    • https://cplastik.com/data/cms/file/55960075363.pdfIn PDF document text
    • http://kasargod.net/uploads/file/29217880707.pdfIn PDF document text
    • https://vishalahospitality.com/ckfinder/userfiles/files/17123271766.pdfIn PDF document text
    • http://njxinbell.com/upload/files/wumutopupilulasazelenov.pdfIn PDF document text
    • http://chuabenhxuongkhop24h.com/images/files/xajirabudijedobatoso.pdfIn PDF document text
    • https://xn--lenachatka-57b.pl/uploaded/file/fagizizapidofivuvagis.pdfIn PDF document text
    • https://seeandhearbetter.ie/img/shop/contents/57951100267.pdfIn PDF document text
    • http://esteticka-stomatologie.cz/files/content/file/davowogozabujokoj.pdfIn PDF document text
    • http://centonze-vini.com/userfiles/files/papanazozakoj.pdfIn PDF document text
    • http://daiichibus.vn/uploads/news_file/62475816604.pdfIn PDF document text
    • https://www.bmo-agencement.fr/ckfinder/userfiles/files/25605915614.pdfIn PDF document text
    • http://misr-consult.com/userfiles/file/lujasik.pdfIn PDF document text
    • https://khabul.mn/mmpa/userfiles/files/44108064773.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/99936353325.pdfIn PDF document text
    • https://aaaxxion.info/images/file/panodozetidoxas.pdfIn PDF document text
    • http://www.oe.com.tw/ezadmin/ckfinder/userfiles/files/zamekakadazab.pdfIn PDF document text
    • https://deltarents.com/upload/ckfinder/files/12718632882.pdfIn PDF document text
    • http://tfforming.ru/d/files/48718785634.pdfIn PDF document text
    • http://zjleiou.com/images/upload/File/77071599545.pdfIn PDF document text
    • http://dtpokebar.com/uploads/files/risuvapakisuxipufinepir.pdfIn PDF document text
    • http://eldorautomaticgates.com/UserFiles/file/wibidajavo.pdfIn PDF document text
    • https://alternativecarrepair.nl/userfiles/file/25702319861.pdfIn PDF document text
    • http://bong-dem-long.org/upload/editor/files/93632577340.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_off0000b3a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3A6 11088 bytes
SHA-256: 5c98a3f72df6f801fb94676680b69f08dfd44de8971b9a1498f1700a6492cf31
font_01_sfnt_off0000cd19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD19 16020 bytes
SHA-256: 5ae8b217926da4631bb616c69215430302505b421822d2ed037d085c64496a0a
font_02_sfnt_off0000f5ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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