Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bb1e4965aa68932…

MALICIOUS

PDF

75.8 KB Created: 2021-05-23 07:32:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2b9a7795dd9a764ee71c201518f6eedc SHA-1: daa3f72949d4718382d6df1739d0a4cb8e4630b3 SHA-256: 5bb1e4965aa689321d3569f67359b9b131c6614419488a2593692fab93a026b8
156 Risk Score

Malware Insights

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

This 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, with one pointing to 'https://soxebez.ru/strik?utm_term=heaven+help+my+heart+chess+sheet+music+pdf'. This indicates a likely phishing or malware distribution attempt, masquerading as chess sheet music to entice users to click the malicious link. No scripts were extracted, but the presence of external links is sufficient evidence for the attack pattern.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://soxebez.ru/strik?utm_term=heaven+help+my+heart+chess+sheet+music+pdf
    • https://cdn-cms.f-static.net/uploads/4384645/normal_602cf4862c0ee.pdf
    • https://cdn-cms.f-static.net/uploads/4446382/normal_60134d7026d6a.pdf
    • https://ropadapolope.weebly.com/uploads/1/3/0/9/130969983/rabewir.pdf
    • https://static.s123-cdn-static.com/uploads/4379616/normal_5fcbecf22b94f.pdf
    • https://cdn-cms.f-static.net/uploads/4446915/normal_602b74fe9ee2b.pdf
    • https://static.s123-cdn-static.com/uploads/4426085/normal_5ff634fbc9739.pdf
    • https://static.s123-cdn-static.com/uploads/4377371/normal_6008e4be1dec5.pdf
    • https://static.s123-cdn-static.com/uploads/4421474/normal_5ffa7f096d24b.pdf
    • https://static.s123-cdn-static.com/uploads/4366630/normal_5fdfb69505390.pdf
    • https://cdn-cms.f-static.net/uploads/4423148/normal_605b9beab9c21.pdf
    • https://kewisivi.weebly.com/uploads/1/3/2/6/132681156/23fadcb6774.pdf
    • https://cdn-cms.f-static.net/uploads/4383699/normal_6049a0b74de65.pdf
    • https://static.s123-cdn-static.com/uploads/4413346/normal_60082dea59962.pdf
    • https://cdn-cms.f-static.net/uploads/4451376/normal_5fd8cd67a97c0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/14617544-9914-4bf6-b39e-7e026089fe53/37062317052.pdf
    • https://uploads.strikinglycdn.com/files/8dfc54ce-d4b2-48d3-b900-a06950a8a49a/73594565589.pdf
    • https://uploads.strikinglycdn.com/files/b2a14b42-86f2-4914-9a3f-fee9f887098a/wivimosovo.pdf
    • https://uploads.strikinglycdn.com/files/75149ccf-0a40-42ba-8e9e-b428355335d1/taduxixajidologugiti.pdf
    • https://uploads.strikinglycdn.com/files/60db5826-558e-4c54-a916-42fff0af9bb9/sentence_level_reading_comprehension_worksheets.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9aa.bin
f492ad286d84b5ef3fba42e6a1641f0fb38994c1d4d6b051b876814f590415ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9AA 5520 bytes
font_01_sfnt_off0000fc51.bin
9898cf96c5637541f01cf0d42fc88be3ec2fbb2beac5844c961849762ff1e1a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC51 10592 bytes

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