Malicious PDF — malware analysis report

Static analysis result for SHA-256 5aa902d432291d82…

MALICIOUS

PDF

99.8 KB Created: 2021-04-07 02:31:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 8bb69f0010e3ce993903ca53b3d9aaf2 SHA-1: 1c7c7f176a835a553ae3bd966b9ba426d7cd41a2 SHA-256: 5aa902d432291d824624e04c27836a0c04618c86c2e83e62498a22a4703f7c65
126 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO manipulation tactic. The primary URL, 'https://resalured.ru/strik?utm_term=graphing+review+worksheet+algebra+1+answer+key', is presented as a worksheet answer key, likely to attract clicks. While no scripts were explicitly extracted, the PDF structure and numerous external links indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://resalured.ru/strik?utm_term=graphing+review+worksheet+algebra+1+answer+key PDF link annotation
    • https://fodukajanewirom.weebly.com/uploads/1/3/5/3/135383911/6053603.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454045/normal_605cfc6b59eba.pdfIn PDF document text
    • http://fruitslope.online/44738532197znkm3.pdfIn PDF document text
    • https://lumirofelefepo.weebly.com/uploads/1/3/4/8/134892557/kojupepimow_fabeximine_lefadewelugu_letexijiteraz.pdfIn PDF document text
    • https://difototasewi.weebly.com/uploads/1/3/5/9/135986065/butokegolabu-dobijebigolaze-julelan-jezalikimimim.pdfIn PDF document text
    • https://tesejusijup.weebly.com/uploads/1/3/4/7/134704228/6891865.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366311/normal_60260d019ecd9.pdfIn PDF document text
    • https://wemovimezatura.weebly.com/uploads/1/3/4/6/134611727/moxexunixomopujix.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476133/normal_5fda481ed6fc8.pdfIn PDF document text
    • https://tataberoxem.weebly.com/uploads/1/3/0/8/130874397/453bd7c5016542.pdfIn PDF document text
    • http://mignonette.space/20229865294yk9zh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497372/normal_600a5f3719604.pdfIn PDF document text
    • https://dagepafu.weebly.com/uploads/1/3/2/7/132740813/pigalolewegokel.pdfIn PDF document text
    • https://vusuvokitajize.weebly.com/uploads/1/3/0/8/130874031/negisakenifa-japitesabukuza-tuwipo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454556/normal_6061091eb4103.pdfIn PDF document text
    • https://nowuvufeguxebib.weebly.com/uploads/1/3/2/8/132814980/1951fe86eda4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ddd054bd-5d62-44c9-abaa-7faa2727bff7/husqvarna_372xp_x_torq_price.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9b54263-8e9b-49df-b458-1651ed1d4ae4/kakek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6fa02013-cff9-4571-b6b7-46f2ea72d278/shirley_jackson_movie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d33fc366-e048-45ac-963f-9943a2e203a0/78820468142.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64f065da-2b54-485e-85ee-057f0eaca501/how_to_descale_avent_electric_steriliser.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000101f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F3 3484 bytes
SHA-256: 69eee602b0ba01228cc7fd7d5fad800f993bf34fe9c5bee6a29cfe1477397e51
font_01_sfnt_off00010e6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E6E 5620 bytes
SHA-256: 0a9345aa6b97addc61fa06d1d880f5fed457d45125cb29def14f5ee5d0e0b969
font_02_sfnt_off000121aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121AA 16120 bytes
SHA-256: f0fa17d0b6514dbfeaf998ea8f25047d8903af8889ea8c13de401ae4f3ecd439
font_03_sfnt_off00015794.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15794 16912 bytes
SHA-256: 07497b4dd1685fb33d87dca2777c8275df3fd3e4df1abafc9142d52ac22ff9d5
font_04_sfnt_off00016fb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16FB5 6052 bytes
SHA-256: 583ea0850cdb5a182bbab3a06c7d882b9a5dd918767fd0174a02e48dde8adacd

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