Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9d8395ede29b939…

MALICIOUS

PDF

72.3 KB Created: 2021-05-29 06:23:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5eab92fea0f798a7c8b4bcb6043516b9 SHA-1: 6c870d875634c3525c3c4c53607a28f60dd18594 SHA-256: e9d8395ede29b9396054b35aaf1d8bc8fb5301730333d7bdb59c7a6878f589d7
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to PDF files hosted on various domains, suggesting a link farm or SEO poisoning tactic. The embedded content, though heavily obfuscated, appears to be related to search queries for song lyrics, indicating a lure to drive traffic to these external sites. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external URIs supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://golowaki.ru/strik?utm_term=ennavale+adi+ennavale+lyrics+mp3+song+download
    • https://cdn-cms.f-static.net/uploads/4480397/normal_5fd27563bc242.pdf
    • https://cdn-cms.f-static.net/uploads/4486975/normal_605bc2300b39f.pdf
    • https://cdn-cms.f-static.net/uploads/4489980/normal_605b1d035053a.pdf
    • https://cdn-cms.f-static.net/uploads/4483589/normal_6064e6da30d83.pdf
    • https://xemaxokiba.weebly.com/uploads/1/3/4/3/134350412/tofenibiviwojuwimuji.pdf
    • https://cdn-cms.f-static.net/uploads/4480403/normal_604fe8057fec3.pdf
    • https://novedoxax.weebly.com/uploads/1/3/4/5/134512377/rasiluxig.pdf
    • https://wogakidip.weebly.com/uploads/1/3/5/3/135384189/jukotudumuwaru_kivetis.pdf
    • https://ferowadamo.weebly.com/uploads/1/3/4/5/134593689/towotimaker.pdf
    • https://cdn-cms.f-static.net/uploads/4368985/normal_5fd830757c265.pdf
    • https://cdn-cms.f-static.net/uploads/4385617/normal_5fd15b2f99252.pdf
    • https://dununatanag.weebly.com/uploads/1/3/0/7/130775655/cdb99a14de.pdf
    • https://bazewubudib.weebly.com/uploads/1/3/4/7/134731154/57b08d917bc.pdf
    • https://cdn-cms.f-static.net/uploads/4379032/normal_60698d8ce8e7f.pdf
    • https://ratexema.weebly.com/uploads/1/3/4/7/134720574/f58c3645ff8e48e.pdf
    • https://cdn-cms.f-static.net/uploads/4489428/normal_6012794ba2573.pdf
    • https://cdn-cms.f-static.net/uploads/4393763/normal_5fe7fe6433fa7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/66353cdc-5787-4b3b-aaf8-0b52d1dafa85/8268169204.pdf
    • https://uploads.strikinglycdn.com/files/d5a0acd4-279a-41f4-a00b-9d7077752a1d/9361854699.pdf
    • https://uploads.strikinglycdn.com/files/ceb29af6-57ed-4f25-b5ef-33704094955c/bolawetazikili.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_off0000dd87.bin
ca4b07dff3f1a2757a1d2fe7c4ae350f9b7a105d8a5603f8482f639c4729097b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD87 5768 bytes
font_01_sfnt_off0000f13a.bin
c9ca52953214be3d999267a59a775f260230119c035aab5c00bdf86125222817		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF13A 10044 bytes

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