Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa8c444091ccdb21…

MALICIOUS

PDF

82.4 KB Created: 2021-09-17 05:20:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2c1186b427ecebf8c9332ae7d7b8d278 SHA-1: 7cdc517a58b3f0541d792cdcd8654761343569b4 SHA-256: aa8c444091ccdb21f62a67d6feba224a326976e31f165d60f651f1ed24d81664
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous external URIs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of an IP address literal in a URI further indicates suspicious activity. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://pistant.ru/uplcv?utm_term=code+promo+coyote+android PDF link annotation
    • http://joy05.com/_UploadFile/Images/file/someduk.pdfIn PDF document text
    • http://novelinternationalschool.com/ckfinder/userfiles/files/rawatijetejagodimajegipe.pdfIn PDF document text
    • https://ipkameros.lt/userfiles/file/femulafod.pdfIn PDF document text
    • http://mygiftltd.com/userfiles/file/59180450723.pdfIn PDF document text
    • https://ud-hobby.com/images/Upload/file/matugogemitisijexox.pdfIn PDF document text
    • http://cheers-gifts.com/userfiles/74503504419.pdfIn PDF document text
    • https://comillaspostgrado.es/userfiles/file/18264344021.pdfIn PDF document text
    • http://ljjxmining.com/uploadfile/file///2021091417171993.pdfIn PDF document text
    • http://hz-kontejnery.cz/ckfinder/userfiles/files/vafapuzazunimulegura.pdfIn PDF document text
    • http://sinocelltech.com/filespath/files/20210914092404.pdfIn PDF document text
    • http://140.121.161.111/ckfinder/userfiles/files/93505115125.pdfPDF link annotation
    • https://nabsangram.com/userfiles/file/vokolelenutazesidetirodu.pdfIn PDF document text
    • https://promaxsuspension.com/csmimage/file/supobupixujuvu.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc37fc6276---pumigawosufatamaxixi.pdfIn PDF document text
    • http://www.radanhorse.com/resource/files/99318953824.pdfIn PDF document text
    • http://cuacuontoanthang.com/media/file/60413637481.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613495dc93454---dujexotub.pdfIn PDF document text
    • http://live-net.it/file/82944724581.pdfIn PDF document text
    • http://imosa.asia/uploads/files/202109011552485826.pdfIn PDF document text
    • http://ucg-eg.com/userfiles/file/34604520882.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/naleporusejomuko.pdfIn PDF document text
    • http://batterseataxi.com/survey/userfiles/files/tanodasef.pdfIn PDF document text
    • http://diplomat2014.ru/ckfinder/userfiles/files/kuwalukapivosawisag.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_off0000dba9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA9 18576 bytes
SHA-256: 84bf854ba90165d3acfe62dc6dd03319c235976e8bb56e76cc096f9a63bbc0dc
font_01_sfnt_off00010c34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C34 10604 bytes
SHA-256: 37750d6778063c7e1d0a8155b43bec47ebf6c8d3ceca20dd10c95dbfb18aa4cc
font_02_sfnt_off00012470.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12470 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1