Malicious PDF — malware analysis report

Static analysis result for SHA-256 a120a2161b2c4569…

MALICIOUS

PDF

74.2 KB Created: 2021-05-04 07:05:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 12ec769e24bbfa408d546f45f1b5dd70 SHA-1: 1882c5b8d57150bdc80431d42a9e689733605e55 SHA-256: a120a2161b2c4569340fa336fd779d7e1be7df2fe99d7fd305d55fc8beb5d7a9
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 0.9997

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://bologen.ru/strik?utm_term=fisher+price+pink+petals+jumperoo+assembly PDF link annotation
    • http://extrameets.fun/literary_techniques_used_in_the_tell_tale_heartc45gf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460477/normal_60480a3ee3deb.pdfIn PDF document text
    • http://heretythere.site/remutoxubuxudov3hovv.pdfIn PDF document text
    • https://vetolotex.weebly.com/uploads/1/3/1/3/131379132/459aa.pdfIn PDF document text
    • http://leopards.space/47795578191o7j73.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445866/normal_600e82c554b25.pdfIn PDF document text
    • http://bostpolamos.site/fexesolezuh67in.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457839/normal_603bcb823164b.pdfIn PDF document text
    • https://noxerurivago.weebly.com/uploads/1/3/4/7/134767941/cae92c0da9d0e8.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/721920f5-4b24-4185-9b60-e23237602e10/41889492502.pdfIn PDF document text
    • https://e05653fc-386e-4c8b-889d-738aee72c63e.filesusr.com/ugd/62421a_6ac296d169ec4083a96f408b75957b68.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bojafazes/radedojurorekejomatulup.pdfIn PDF document text
    • https://dfa52777-3edb-460f-9b14-ca5101cd4ecc.filesusr.com/ugd/5360f8_157c900d156e45c9a498c0e469882541.pdf?index=trueIn PDF document text
    • https://c3373aeb-ed74-4f2d-b631-fa679e0a3f6f.filesusr.com/ugd/cbe7f7_df899a1f823849c7811f559f11179e1b.pdf?index=trueIn PDF document text
    • https://275320ff-96dd-455a-9699-a0fdc58b27a5.filesusr.com/ugd/943725_28006ef359234a9aaee6bdfab9a7031b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f6bb563-b86c-4581-9be8-746e4996006c/farberware_single_serve_coffee_maker_issues.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d891636-7ed8-42e5-b656-825ebef92c1b/is_the_bobo_doll_experiment_reliable.pdfIn PDF document text
    • https://f38be386-5799-403b-9303-fb121113655a.filesusr.com/ugd/6f1aa7_734e4552ac3c4165a1ecc1e3239a18c1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/56a5de5c-b35a-490a-af27-54e124027664/28249436593.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97033eb7-08ed-4331-815f-afe37f64472a/77077889748.pdfIn PDF document text
    • https://s3.amazonaws.com/bidivo/scratch_2_for_windows_10.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_off0000e385.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE385 5512 bytes
SHA-256: 026727d3b65eebb70735a7cc3702900a199d9a0bb87480314c12e6f1943a23f1
font_01_sfnt_off0000f62b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF62B 10300 bytes
SHA-256: 372b7f34d202b10ccadd49d30d7459d69d74dd6fc17ee06ab13febac05cb196c

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