Malicious PDF — malware analysis report

Static analysis result for SHA-256 874c91b6e7ffd7b4…

MALICIOUS

PDF

68.3 KB Created: 2020-11-18 11:26:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 95f61739f3ffb4e65b7b8fde7390175e SHA-1: 47fd979a12faf246cbce6f8dff4edbdd9b0043a2 SHA-256: 874c91b6e7ffd7b42234c402f37c9f68626337727b69296448062f6de445f4da
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. The primary malicious URL, 'https://traffking.ru/strik?utm_term=cooke+center+grammar+school+weebly', suggests a phishing or scam attempt. ClamAV detection and ML classification further support its malicious nature, indicating it's likely a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffking.ru/strik?utm_term=cooke+center+grammar+school+weebly
    • https://gopufiraw.weebly.com/uploads/1/3/4/5/134590690/2267967.pdf
    • https://kibodowusi.weebly.com/uploads/1/3/4/5/134588916/bazemokoboletup.pdf
    • https://cdn-cms.f-static.net/uploads/4405953/normal_5fa834ec59b57.pdf
    • https://guwomenod.weebly.com/uploads/1/3/0/8/130873843/nojof.pdf
    • https://ponixojezunuto.weebly.com/uploads/1/3/0/9/130969897/telus-zavuf-pegena-fejixidafix.pdf
    • https://rumidevuj.weebly.com/uploads/1/3/4/3/134310249/b3f0dc5d.pdf
    • https://cdn-cms.f-static.net/uploads/4378405/normal_5fa05cc9ba9af.pdf
    • https://xetibipu.weebly.com/uploads/1/3/4/5/134528590/69fe2f69910a1.pdf
    • https://cdn-cms.f-static.net/uploads/4490269/normal_5fac04faefe3c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/196e0169-d20d-410a-acc0-3d289cfd3f42/bopavesijiweleluf.pdf
    • https://uploads.strikinglycdn.com/files/77928eab-3b0b-4209-bccc-9d8480eac3cf/viroxuvofenijoveso.pdf
    • https://uploads.strikinglycdn.com/files/dd550689-d02b-447e-b34e-5344c70e3c29/37510701529.pdf
    • https://uploads.strikinglycdn.com/files/bedf56e7-1a2b-44da-b0d4-7838335e7a38/nobilazivivo.pdf
    • https://uploads.strikinglycdn.com/files/52efee76-00d2-4bc7-9269-783755e481ec/97151793907.pdf
    • https://uploads.strikinglycdn.com/files/3e0a8f7a-685f-4ac6-a564-a28aa1c7e12d/rimitovoku.pdf
    • https://uploads.strikinglycdn.com/files/687b7e0b-ef6a-46c1-acf9-a81ddf1c94db/gukazi.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c138.bin
a5d69dbd1ab1b5b1b040d6628c9c95de248c204dfee65e63d37a529a54306a9c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC138 5372 bytes
font_01_sfnt_off0000d364.bin
54f51c465460224104f294c54a48b68e8cc620f2fcb999b5879197774df0f399		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD364 10160 bytes
font_02_sfnt_off0000f5e5.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E5 4324 bytes

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