Malicious PDF — malware analysis report

Static analysis result for SHA-256 21acbecd222771fa…

MALICIOUS

PDF

82.2 KB Created: 2021-03-16 04:19:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 344d0b6e1a7f652a4beb47533ed3430b SHA-1: 92856dedbdb9e03bdcac8f19212a5ca4c5687ffc SHA-256: 21acbecd222771faaa9ca3f1ddd4c3d30ed10b30eba0da674e8f1c5f1a7b996d
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jacksth.ru/strik?utm_term=how+to+set+time+on+timex+t2312+alarm+clock PDF link annotation
    • https://noxaxubobef.weebly.com/uploads/1/3/1/3/131380993/9520813.pdfIn PDF document text
    • http://nugekurobeju.iblogger.org/free_american_flag_pics.pdfIn PDF document text
    • https://senekuzoje.weebly.com/uploads/1/3/5/9/135978249/3480931.pdfIn PDF document text
    • https://leketupafap.weebly.com/uploads/1/3/4/5/134527175/4418712.pdfIn PDF document text
    • https://wawodupalise.weebly.com/uploads/1/3/4/6/134621762/568e1d0012d0e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451039/normal_5fc5c0f218ced.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391047/normal_604ba3d34a6dc.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/0a3e33ae-3c98-4fc8-87a1-4413e16e5fc9/types_of_brainstorming_in_reading_and_writing.pdfIn PDF document text
    • https://5f8b0e40-2141-4341-98ab-6145db4b8156.filesusr.com/ugd/2072cd_77bcad02a11848259eb9dc497950e17d.pdf?index=trueIn PDF document text
    • https://bf68d742-fb98-404a-ab47-1dcf24f7df52.filesusr.com/ugd/83e7fd_5e9211d109a649528a41ba1ae01fae1a.pdf?index=trueIn PDF document text
    • https://ad0d0dbb-669b-46a9-85df-79487014a0f3.filesusr.com/ugd/00d95d_4f37ffe9bb3c4cf0ae6e69eaa69492d8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/abc7500d-00c6-4f37-84c7-233c3db3d64a/lekuna.pdfIn PDF document text
    • http://zumozitaporoka.epizy.com/62827258596.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ded67e3e-ff56-4e77-b264-9d2975004617/how_to_change_oil_in_craftsman_6.25_lawn_mower.pdfIn PDF document text
    • http://favekagopu.epizy.com/pafusapamotixagi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f293c4d0-d48b-46b6-a731-53972247bca9/tijolaxavubujosem.pdfIn PDF document text
    • https://b01cffea-7a05-49e8-9781-04202a21c04b.filesusr.com/ugd/d5d855_39f34261ac20415ba2073ae70b192652.pdf?index=trueIn PDF document text
    • https://5f98d79b-b704-4ecc-a618-200e52db7f79.filesusr.com/ugd/d1a5b7_a176b9a853d04b0391551e97c97bdbc6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/42ca835b-40d2-46c4-8557-b25d3fbf42e1/suvifenonomexekem.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001026f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1026F 5480 bytes
SHA-256: 5904f016da34402ecb280aa67ce78f595bbcbc983380ab684b32d032d6465360
font_01_sfnt_off0001150c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1150C 11292 bytes
SHA-256: 2c0e3ccada48716c60007867ce257f02280e6607585efc945f74d61bec21d094

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