Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3ced70f10301c30…

MALICIOUS

PDF

86.6 KB Created: 2021-02-17 03:09:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 9af8505ab0f127e4aaa5d5286b5b48be SHA-1: 5e4926dad5e2d20cbcd84035c779c26eb59c2256 SHA-256: a3ced70f10301c302f697348dd07b704ceaba05230c28629ae60596b236b4f64
126 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many hosted on disposable domains or subdomains, indicative of a link farm or SEO spam operation. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the presence of numerous external URIs suggests the document's primary purpose is to redirect users to potentially malicious or unwanted content, likely as part of a phishing or spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • 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://bologen.ru/wix?keyword=how+many+months+in+a+school+year+philippines PDF link annotation
    • https://cdn.sqhk.co/ruzaxube/hhgcWX2/nokagowalomurifoji.pdfIn PDF document text
    • https://cdn.sqhk.co/wujugojuse/tVxichh/barbershop_3_streaming.pdfIn PDF document text
    • https://mamufitixiru.weebly.com/uploads/1/3/4/6/134640278/405779.pdfIn PDF document text
    • https://cdn.sqhk.co/kikolibub/tifhbhc/org_2021_apk_download.pdfIn PDF document text
    • https://cdn.sqhk.co/vobipibomuk/ghfxDjJ/texanadezawojivufafutor.pdfIn PDF document text
    • https://cdn.sqhk.co/vufisolepu/vV2aiiX/94126737281.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374953/normal_6029560dc30fc.pdfIn PDF document text
    • http://wisevesimo.22web.org/46231043749.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486534/normal_5fdcfaa50e74c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469104/normal_5fc8e17f5a539.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365649/normal_600ea0466202e.pdfIn PDF document text
    • https://cdn.sqhk.co/rorezina/CvifE7g/81044301347.pdfIn PDF document text
    • https://xujikipige.weebly.com/uploads/1/3/1/3/131379844/kusixugenufitazinig.pdfIn PDF document text
    • https://cdn.sqhk.co/sisadenev/hifo9hb/warrior_cats_game_on_scratch_by_wild_flight.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463560/normal_5ff0922952531.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://lemijafuw.epizy.com/how_to_get_old_dataflow_report.pdfIn PDF document text
    • http://tenasupufowok.epizy.com/41040988979.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001089b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1089B 5116 bytes
SHA-256: dc8daea81f4ec60d4523ed20088ab8e66c2480ec9e833877cb350a3e4b104a47
font_01_sfnt_off000119d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119D5 10704 bytes
SHA-256: d341549f7643ada8f6159fdd4e3d6044fa7348c9e04455cc12bfab5be1ed1e14
font_02_sfnt_off00013e71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E71 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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