Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b3499008b9a21fd…

MALICIOUS

PDF

71.0 KB Created: 2021-01-11 13:43:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: dc9e42b3cc988bb52a98b0bbbe04510e SHA-1: bc043fa245b8bd2ba101bf187ba18ba8bcc00d13 SHA-256: 7b3499008b9a21fd8c5bf64350495c11a115855bdc3dd0dff9c17fef15dcc85b
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one identified as a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites. The document body is heavily obfuscated and contains metadata suggesting it was generated by wkhtmltopdf, which can be used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gettraff.ru/123?utm_term=unequal+heating+of+the+earth In PDF document text
    • https://site-1178304.mozfiles.com/files/1178304/hearts_of_iron_5_cheats.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408476/normal_5fb557e843094.pdfIn PDF document text
    • https://cdn.sqhk.co/vasegodesazu/Mi8ig76/nedupinojitemusotibitit.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393639/normal_5f94f60273f0e.pdfIn PDF document text
    • https://site-1212417.mozfiles.com/files/1212417/sinister_sausage_eyes_scream_the_haunted_meatloaf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384645/normal_5ff97b93f1864.pdfIn PDF document text
    • https://cdn.sqhk.co/fuwufupi/jicpSgf/92411646684.pdfIn PDF document text
    • https://site-1177236.mozfiles.com/files/1177236/dunkin_donuts_drift_caramel_craze.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387242/normal_5fcad353202b5.pdfIn PDF document text
    • https://pukotegifo.weebly.com/uploads/1/3/0/8/130874060/buguruj.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/jarawaxanivu/27794675810.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_off0000cc9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC9E 4852 bytes
SHA-256: ea12bd57f79c50ef5588ddbd375bf9af3953ea47807e99d811b779529422e0ad
font_01_sfnt_off0000dd0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD0F 10724 bytes
SHA-256: 1d28273befeae89731ba68351f0d00fdd38acc334b39b87962166963cfc7f54a
font_02_sfnt_off00010183.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10183 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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