Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fb9b53ec5e9fa7f…

MALICIOUS

PDF

85.5 KB Created: 2021-06-11 10:30:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 052cee16718957ba4efb025e8eb4aaa1 SHA-1: 17424986eb78817759a9f294a272469ba8d95c94 SHA-256: 2fb9b53ec5e9fa7fa8daca3b062d1d3716e2279c36c0db717b1cf4b03fb55a74
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9887

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://pixomot.ru/pbw?utm_term=naruto+storm+4+mods PDF link annotation
    • https://gaxepofujar.weebly.com/uploads/1/3/5/3/135348048/4039760.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420019/normal_6008ea98b2add.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406169/normal_605180851a2f3.pdfIn PDF document text
    • https://sazezikamujut.weebly.com/uploads/1/3/1/4/131438312/kewopiwolubaru_denujuge.pdfIn PDF document text
    • https://vudovonijojor.weebly.com/uploads/1/3/1/4/131437364/9247475.pdfIn PDF document text
    • https://zobatovegu.weebly.com/uploads/1/3/0/8/130873738/8770659.pdfIn PDF document text
    • https://zamomojufowa.weebly.com/uploads/1/3/4/6/134613680/046ec.pdfIn PDF document text
    • https://topuzuxet.weebly.com/uploads/1/3/0/7/130739133/9a05b857aa9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447280/normal_6000475dcad79.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454043/normal_60563ce68f467.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368487/normal_601a6a8507fd8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479240/normal_602147b367a10.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457305/normal_603e187d75182.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407789/normal_5fe9d37a4ff3b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379603/normal_6037eafb53496.pdfIn PDF document text
    • https://towavakivuno.weebly.com/uploads/1/3/5/3/135318123/zanizupusadonixifize.pdfIn PDF document text
    • https://sinidakebe.weebly.com/uploads/1/3/4/5/134591073/efa35df9a09.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492580/normal_5ff4cb12ac7ff.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491451/normal_5fcad5449375b.pdfIn PDF document text
    • https://jukirabupunux.weebly.com/uploads/1/3/0/8/130874410/1179977.pdfIn PDF document text
    • https://rivebopufu.weebly.com/uploads/1/3/4/6/134663658/jedowakadoxag.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
    • https://uploads.strikinglycdn.com/files/a24f76c8-53c6-4c1a-bbc8-15db6b80770b/90479901158.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e2decd9-9f98-47b4-ace0-7f071ebe4fd7/guxunokewutirojigup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82104b78-9a14-4327-9f14-e200f73bf95f/how_to_find_gas_pressure_in_a_manometer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5ea45fa-f69b-4df0-a9be-80bcd4a6a227/how_can_you_tell_when_airpods_are_fully_charged.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7d40965-afcd-41cd-9208-1341dad0823b/pejuje.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eafa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAFA 4608 bytes
SHA-256: b4ea4e74635dc5c3b44e4d8ae7a60f7e29bb8058f7ca9163655f850330b0d7d5
font_01_sfnt_off0000faa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA0 10820 bytes
SHA-256: 4dead1fae5512e3c71882fce4b7590c82b68093361b2e339a117ac3c32dd9ae6
font_02_sfnt_off00011fa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA9 17112 bytes
SHA-256: f9dc15b9e7e1a45eeec377706f6e9859ce73b6054018bdf95ecdbdcfaa16ab0e
font_03_sfnt_off0001380e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1380E 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176