Malicious PDF — malware analysis report

Static analysis result for SHA-256 fef056c4bd8df4f4…

MALICIOUS

PDF

86.0 KB Created: 2020-12-22 05:19:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 0b6e8340aaabee8ac7807e38c7cb4bc1 SHA-1: e8787b1e1aaf980f390bd4455e41f9004bb7c1d4 SHA-256: fef056c4bd8df4f4400417284437c938610199bbd873f43e76a3a488cc43a4a8
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are to SEO-optimized PDF farms, suggesting a link-farming or phishing attempt. One prominent URL, 'https://trafffe.ru/strik?utm_term=tap+adventure+time+travel+mod+apk', appears to be a lure for a modded application, indicating a phishing or malware distribution vector. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafffe.ru/strik?utm_term=tap+adventure+time+travel+mod+apk PDF link annotation
    • https://kotonimurapuva.weebly.com/uploads/1/3/4/4/134440920/pelorosube-xusil-pegozitejukor-tetiruxenebogo.pdfIn PDF document text
    • https://dawemewi.weebly.com/uploads/1/3/4/7/134747996/57df255d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447641/normal_5faa3b52f3e21.pdfIn PDF document text
    • https://rukinedofixod.weebly.com/uploads/1/3/4/3/134348838/gumifeduvojarixov.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2885d0f-f4d4-4633-8096-a96d9627c6d7/boulangerie_meaning_and_synonyms.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f0ccfe3-402d-41ad-b16f-6e1a11fd7b2e/hidden_valley_high_school_oregon_athletics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e92714b-e7f3-44be-984e-104b0d6a3695/zawirisadodijokinimub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c59e65ee-56b8-4497-b07f-b678e94acebd/67246033841.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e57fe75f-7c9f-4ca1-b54c-e4182ea6b5c1/55411505117.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2424ae1-002e-4175-997d-88caa48e0050/zovanugugaxifex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a26880a-b72a-4470-80fd-1699b55d83a5/49896011756.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_off000116db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116DB 5000 bytes
SHA-256: c505b2ca9dd3cfe5f8a39dbc3b8e262f763e2f4a17fd003b357cec56c366e2b1
font_01_sfnt_off000127d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127D2 10556 bytes
SHA-256: e5448008d5600f1e713b80014533ded9e253f4fcfb9c38f5957e2f082bbfdb61

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