Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a6b9dfd9c727ec4…

MALICIOUS

PDF

76.7 KB Created: 2021-03-27 12:12:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: c0a3dbc689047e86344d62b811d01929 SHA-1: edda431ad9c5e75d368ae320748086a40d3b9256 SHA-256: 7a6b9dfd9c727ec437c408bd264a0ca363416786c305b48282aff28c62ce640b
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and 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 0.9993

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://mezovuduw.ru/award?keyword=anthropological+theory+an+introductory+history+pdf PDF link annotation
    • https://sinitilelimokiz.weebly.com/uploads/1/3/4/3/134348988/tiziteno.pdfIn PDF document text
    • https://pabibajezejav.weebly.com/uploads/1/3/5/3/135323938/5909834.pdfIn PDF document text
    • http://finonit.mypressonline.com/odyssey_fagles_full_text.pdfIn PDF document text
    • https://kofitabalu.weebly.com/uploads/1/3/0/7/130775223/zepazipolokoredajun.pdfIn PDF document text
    • https://sufotope.weebly.com/uploads/1/3/0/7/130775917/nilikubet-barig-vimizuguvitogis.pdfIn PDF document text
    • https://sizokagijabid.weebly.com/uploads/1/3/4/6/134652394/bb4c430e.pdfIn PDF document text
    • http://giwosoto.sportsontheweb.net/59893352832.pdfIn PDF document text
    • https://fabebebu.weebly.com/uploads/1/3/2/7/132740756/bikazuz.pdfIn PDF document text
    • http://slimerecipe.org/28508997247qge5s.pdfIn PDF document text
    • http://marafonsport.site/walmart_covid_vaccine3afkq.pdfIn PDF document text
    • https://tatonipek.weebly.com/uploads/1/3/4/8/134874136/robel_rasifase_jisune_milixitiwe.pdfIn PDF document text
    • https://losewilim.weebly.com/uploads/1/3/4/8/134854933/c275dc065.pdfIn PDF document text
    • https://duxujemiw.weebly.com/uploads/1/3/4/7/134743688/7309284.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414866/normal_6001815734f04.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501659/normal_5fcaf807e91bb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374963/normal_60594060b8af9.pdfIn PDF document text
    • http://worozoxiw.sportsontheweb.net/seismic_reflection.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420432/normal_600b5219aa6fb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5862e4ea-63a6-4c92-af93-e06d02d1a664.filesusr.com/ugd/eaa371_22925ab250ed46e496ccacb29d38fe78.pdf?index=trueIn PDF document text
    • http://butorinowu.myartsonline.com/kuperulumasaveripuguw.pdfIn PDF document text
    • https://80f75f89-a1e3-4611-a0ef-7a704eb82da9.filesusr.com/ugd/0286dd_d548c64b83eb4d9ab7cf2ca627f70411.pdf?index=trueIn PDF document text
    • http://gafodix.myartsonline.com/sharp_aquos_reset_pin.pdfIn PDF document text
    • https://443275ec-395d-4f86-84c9-2ed7a250e117.filesusr.com/ugd/7d471d_b4ac92a4555e49b28ad390e6eda40486.pdf?index=trueIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC76 5508 bytes
SHA-256: 2307815c366813eab316022b33ace40c2bf3956a085762827ca5b98c12bbe156
font_01_sfnt_off0000ff37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF37 11260 bytes
SHA-256: b3d900e5c868a03a211b53d27ceefd86f6adf2e5e0474d005b9bdc8cb44415f7