Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f4b38ff6d93b64a…

MALICIOUS

PDF

74.9 KB Created: 2021-01-14 17:58:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: a79ec47984e50325437d7a0edef5972e SHA-1: 9fd230285905a238f25f50a010353054094bdeb6 SHA-256: 7f4b38ff6d93b64a4d689573533b04719de36b25317171e4a9cb1d46fac97ad0
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links pointing to external PDF files hosted on various disposable domains, indicating a link farm or SEO manipulation scheme. One critical heuristic identified a link to known malicious redirector infrastructure, and ClamAV detected the file as Pdf.Phishing.Trojan. This suggests the document is designed to lure users to potentially malicious content or phishing sites.

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://gettraff.ru/123?utm_term=mother+of+the+groom+dresses+2015 In PDF document text
    • https://gonotelavekufuf.weebly.com/uploads/1/3/4/6/134615299/buzagukile.pdfIn PDF document text
    • https://xazapadikud.weebly.com/uploads/1/3/1/8/131871762/fopizedevefukor.pdfIn PDF document text
    • https://site-1233793.mozfiles.com/files/1233793/laser_cut_3d_topographic_wood_maps.pdfIn PDF document text
    • https://site-1179282.mozfiles.com/files/1179282/bhagavad_gita_quotes.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384144/normal_5fcb1b9630110.pdfIn PDF document text
    • https://site-1167992.mozfiles.com/files/1167992/rainbow_dust_metallic_paint_light_gold.pdfIn PDF document text
    • https://site-1183516.mozfiles.com/files/1183516/zobemexu.pdfIn PDF document text
    • https://nebumokijisuj.weebly.com/uploads/1/3/5/3/135326708/surapar.pdfIn PDF document text
    • https://bugajujifupub.weebly.com/uploads/1/3/4/8/134894919/d44bdd88fa5a0a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448548/normal_5fc0c95dc88ae.pdfIn PDF document text
    • https://site-1178687.mozfiles.com/files/1178687/zemeged.pdfIn PDF document text
    • https://site-1207652.mozfiles.com/files/1207652/73147729263.pdfIn PDF document text
    • https://misirukizos.weebly.com/uploads/1/3/4/0/134017349/7958186.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pavujiniz/causes_of_stress.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7AA 5532 bytes
SHA-256: 1a5feb2ee36416ee2862eba25db3c52c2c0964c7afd4d516f1ec41d14760b175
font_01_sfnt_off0000fa6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA6E 10552 bytes
SHA-256: 10e8563fc69bf2a260af2829ea19a58a84be74017b211076130081e4a015ee61

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