Malicious PDF — malware analysis report

Static analysis result for SHA-256 cea12b840b65e05c…

MALICIOUS

PDF

65.1 KB Created: 2021-01-21 02:21:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 553585f14126fdd257aa806059d66713 SHA-1: dd010a32207f26c55de7207d304516099af6bc19 SHA-256: cea12b840b65e05cb55974f98c88912ec606c1ec403f7acdc86d5e20391ce1d4
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_LINK_FARM' suggests the document contains numerous external links, likely to facilitate phishing or malware distribution. The embedded URLs, such as 'https://traffset.ru/123?utm_term=frigidaire+professional+series+wall+oven+manual', are used as lures, masquerading as a manual to trick users into clicking.

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
  • 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.
  • 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://traffset.ru/123?utm_term=frigidaire+professional+series+wall+oven+manual PDF link annotation
    • https://cdn.sqhk.co/pozuwifofub/1Ridrjg/43024641655.pdfIn PDF document text
    • https://cdn.sqhk.co/gukokefa/ficN29m/sakepegolufimikupok.pdfIn PDF document text
    • https://site-1167992.mozfiles.com/files/1167992/foser.pdfIn PDF document text
    • https://site-1172347.mozfiles.com/files/1172347/genobekedawepupi.pdfIn PDF document text
    • https://site-1174433.mozfiles.com/files/1174433/ikea_desk_lamp.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416143/normal_5fc87afc3fd49.pdfIn PDF document text
    • https://cdn.sqhk.co/febowozefu/iqieafk/1072170840.pdfIn PDF document text
    • https://kufavugozit.weebly.com/uploads/1/3/5/3/135309998/tubep-wawapidomad-xixisaz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366952/normal_5fc19c906a492.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378381/normal_5ff363f49ad3c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415080/normal_5fbec68a14c7f.pdfIn PDF document text
    • https://cdn.sqhk.co/xesejezisuri/iYkGgco/garisiwiwijazoxibiwudeme.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000c0b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0B0 5468 bytes
SHA-256: 8d335aef68ba5c86dae978a5e7d0305a5465872fce91531c0d20e2829da8ab05
font_01_sfnt_off0000d356.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD356 10764 bytes
SHA-256: 84a0da935ab239618bc193bdfa71a40c49bbdf65e743cfa31aa0e3a037af5cfb

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