Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a0117d54fa59b64…

MALICIOUS

PDF

78.4 KB Created: 2021-01-03 09:39:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 3a29a2a51ef25698190fc707875fa366 SHA-1: 76b863833ebc13210d091d1eecdc044992a56594 SHA-256: 8a0117d54fa59b6406e5320caf2d1c3801555149031e8b94aa18d1cd61d4c2bd
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file contains numerous embedded links, many of which point to disposable hosting services and redirectors, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The document body, though heavily obfuscated, appears to be a lure related to a 'degrees to radians worksheet pdf'. No scripts were extracted from this sample, but the embedded URLs are the primary indicators of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.
  • 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://ggtraff.ru/123?utm_term=degrees+to+radians+worksheet+pdf In PDF document text
    • https://fibigator.weebly.com/uploads/1/3/4/3/134313363/2467891.pdfIn PDF document text
    • https://vikumeniwexawud.weebly.com/uploads/1/3/0/9/130969440/fipabatekak-kagarusufulosab.pdfIn PDF document text
    • https://nopirirog.weebly.com/uploads/1/3/4/2/134234714/7800532.pdfIn PDF document text
    • https://bavifogo.weebly.com/uploads/1/3/4/5/134524367/jaruninajikasenum.pdfIn PDF document text
    • https://maladekokox.weebly.com/uploads/1/3/4/7/134745457/pilegamekaleb-gaginam.pdfIn PDF document text
    • https://cdn.sqhk.co/kopizikob/dnUWhcQ/gabijimuxukema.pdfIn PDF document text
    • https://liwujozixo.weebly.com/uploads/1/3/4/4/134497145/1988616.pdfIn PDF document text
    • https://keniwuki.weebly.com/uploads/1/3/1/4/131483234/7885719.pdfIn PDF document text
    • https://gozofuma.weebly.com/uploads/1/3/0/8/130874065/mezegaliza-mimet-gukilomodekaje-vaxibopekexiti.pdfIn PDF document text
    • https://liletalezawo.weebly.com/uploads/1/3/4/5/134591830/pirutodemu.pdfIn PDF document text
    • https://cdn.sqhk.co/sopiloroda/dvhgdgi/nedamek.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e204a76-9c9f-4ccc-bc14-5804cdcafb47/webafezoperajufarukib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b36cfe6-297f-4ab6-9027-b1df22471166/metrocity_sinema_fiyatlarC4B1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13edf0fd-625f-4d1f-80df-a315581b124b/car_accident_deaths_2019_by_age.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://scripts.sil.org/OFLIn 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_off0000dccf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCCF 5428 bytes
SHA-256: be134518e739d4e53ac757a9b792571625c651443ebbe4b3d7522c5d94c9ac01
font_01_sfnt_off0000ef5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5D 11672 bytes
SHA-256: 5f0067817e9d10c3cbc9e0c901546e148aab5caa68a9d5b72e5f6884eb02d43e
font_02_sfnt_off00011760.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11760 16152 bytes
SHA-256: 5bb2a7a6380d1dfafb539ecff73d32ebbe261088a673e400f34aca4fbad20734

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