Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b9992c0537f7952…

MALICIOUS

PDF

83.6 KB Created: 2021-01-13 17:32:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: ce063b097fc70ba1d0ee7f93dc8a7288 SHA-1: e50bb9f7824362893422f5e258bd1d5dda21fe91 SHA-256: 7b9992c0537f795265d207844a26f13a331c775c295c113bd04cd7eba3cc5388
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious. It contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure (ggtraff.ru). The document body is heavily obfuscated, but the presence of these links strongly suggests a phishing or malware distribution attempt. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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 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/aws?utm_term=backward+and+forward+linkages+pdf In PDF document text
    • https://site-1168034.mozfiles.com/files/1168034/37162398656.pdfIn PDF document text
    • https://jovanifapekiba.weebly.com/uploads/1/3/0/7/130739678/553649.pdfIn PDF document text
    • https://site-1177386.mozfiles.com/files/1177386/10840932031.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477863/normal_5fc479e2962cd.pdfIn PDF document text
    • https://site-1175190.mozfiles.com/files/1175190/free_professional_business_powerpoint_templates.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378856/normal_5f90d77f88bb1.pdfIn PDF document text
    • https://site-1177214.mozfiles.com/files/1177214/suxikuverumubub.pdfIn PDF document text
    • https://site-1084368.mozfiles.com/files/1084368/eventide_pitchfactor_user_manual.pdfIn PDF document text
    • https://site-1168077.mozfiles.com/files/1168077/x_treme_city_rider_electric_scooter_parts.pdfIn PDF document text
    • https://site-1166064.mozfiles.com/files/1166064/21134977418.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383452/normal_5faac62d3c04d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388276/normal_5f9ca9898f926.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387046/normal_5ff2f05b25dd7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/zuvovoxigumuz/80645173689.pdfIn PDF document text
    • https://s3.amazonaws.com/ratixifo/concurrency_in_python.pdfIn PDF document text
    • https://s3.amazonaws.com/rotafasaniz/xogovo.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC74 5236 bytes
SHA-256: 41aa2fa324fc73e2193e4b026c9fbfa2014a7529b2e1a918013d90f7d900063e
font_01_sfnt_off00010e62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E62 10796 bytes
SHA-256: e2c8f24ba4d58390fee963917d118e80c5445aaaa11d12daf585d7ca46bb4abb
font_02_sfnt_off000132de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132DE 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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