Malicious PDF — malware analysis report

Static analysis result for SHA-256 33246a9760e428d4…

MALICIOUS

PDF

76.6 KB Created: 2021-01-15 15:34:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: d4ab736c6408799c1250d16c2b86a04b SHA-1: c4a21ebd44074a19565622c21b92392051d9e7e6 SHA-256: 33246a9760e428d469215d8f8c4e9e9f431f089cfc153236f9ad1d44cb51b9da
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, with one URL pointing to 'trafffe.ru'. ClamAV detected this as 'Pdf.Phishing.Trojan'. The ML classifier also flagged it with high confidence. The document's structure and numerous external links suggest it is designed to redirect users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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.
  • 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/aws?utm_term=badmash+no+1+south+movie PDF link annotation
    • https://site-1175393.mozfiles.com/files/1175393/jabosuruvasid.pdfIn PDF document text
    • https://site-1175531.mozfiles.com/files/1175531/how_batholiths_are_formed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476766/normal_5fb6e86f0898a.pdfIn PDF document text
    • https://site-1202168.mozfiles.com/files/1202168/67935602158.pdfIn PDF document text
    • https://site-1177636.mozfiles.com/files/1177636/triple_j_ice_cream_ottawa_il.pdfIn PDF document text
    • https://site-1174373.mozfiles.com/files/1174373/jepigenimibovixinusozat.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378619/normal_5fa50477ac675.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449406/normal_5fa75ac592942.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366376/normal_5fae055d612fc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454421/normal_5fc9697372f37.pdfIn PDF document text
    • https://tatogupuragafa.weebly.com/uploads/1/3/4/0/134096405/sirarixan.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://s3.amazonaws.com/remeranexe/32442216589.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c2f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2F6 4980 bytes
SHA-256: e6393ad8156f2760184f488670d82a43307d394349efa6801d261fbd36da84d9
font_01_sfnt_off0000d3c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3C6 2332 bytes
SHA-256: dccf7797b4f0a4c6938fdf0ad1d3a7e02e8fdb713779f65d8d5130ec34e9a504
font_02_sfnt_off0000de57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE57 11532 bytes
SHA-256: 667fd07e7a7615b30e7b81c75a1c5fb69111164b1e7e13bef574a6f4a250818c
font_03_sfnt_off0001039f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1039F 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361
font_04_sfnt_off0001119f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1119F 5372 bytes
SHA-256: 4cc3896f10c2dac0c4338b22a5f404fabdec55101c3a435de0c1437e6346e99c

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