Malicious PDF — malware analysis report

Static analysis result for SHA-256 99275affb530d08f…

MALICIOUS

PDF

69.8 KB Created: 2021-09-24 14:24:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 465608ed96de0240dc87e3eaedebee5f SHA-1: f5bff3fd4a53d09cd82e0fd726992391db9e9898 SHA-256: 99275affb530d08f90baf031aeccda9dee805c84b751ec92fda50d8008380715
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, a common tactic for phishing or distributing further malware. The presence of many embedded URLs, even if some are marked benign, supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://ostrichtours.com/ckfinder/userfiles/files/jizom.pdf In PDF document text
    • https://samarthanamparisara.org/apadmin/uploads/userfiles/files/sowiku.pdfIn PDF document text
    • http://unite-chem.com/upload/files/58982341322.pdfIn PDF document text
    • https://rovetco.com/userfiles/file/gawevivilomovalimunilow.pdfIn PDF document text
    • http://doremimarlikinsaat.com/userfiles/file/tunevakupadoxema.pdfIn PDF document text
    • https://vico-immobilien.com/ckfinder/userfiles/files/61518627889.pdfIn PDF document text
    • http://studiosiciliani.eu/userfiles/files/69102343799.pdfIn PDF document text
    • http://allineers.morefriendship.com/upload/files/86669453105.pdfIn PDF document text
    • https://hinaweb.com/upload/file/jewiroxezugalonazinizipu.pdfIn PDF document text
    • https://www.tratedu.net/ssss2018/assets/143ad273/ckfinder/core/connector/php/upload/userfiles/files/524e2b5e352f85ec2bb747adc5097707.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/66842822016.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/048cacb38b718d78ab7ee28f54318c0f/2757120486.pdfIn PDF document text
    • https://mkontroll.hu/File/xilegapubu.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/raxasunobalol.pdfIn PDF document text
    • http://chothuexehochiminh.com/userfiles/file/12495481599.pdfIn PDF document text
    • http://crestviewshopping.abwingsmd.com/uploads/files/jiwemepoxon.pdfIn PDF document text
    • http://freeski.hu/freeski/file/54991997546.pdfIn PDF document text
    • http://abwhopewell.com/uploads/files/63088158309.pdfIn PDF document text
    • http://maekalocal.com/Maeka/UserFiles/File/lonekopovixerabazab.pdfIn PDF document text
    • https://oykufestivali.com/ckfinder/userfiles/files/860266685.pdfIn PDF document text
    • http://nilesk.com/userfiles/file/70186550826.pdfIn PDF document text
    • http://appextskihjthj.handysociality.com/upload/files/jivuvususawenusaza.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/voridawaladizekuxam.pdfIn PDF document text
    • http://digjamaica.com/app/webroot/files/rifoxevanizewabane.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=sakura+live+show+china+apk+for+android+free+downloadPDF 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_off0000ae5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE5E 11040 bytes
SHA-256: e697b2c7d74495abead8527eeb0c579d62eb43602e98a2a01007ace89de7d04f
font_01_sfnt_off0000c804.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC804 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e016.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE016 15400 bytes
SHA-256: 5fcdf8c98121255a1869fcc8a891270e96b1e65a9524ab13663743a93669260a