Malicious PDF — malware analysis report

Static analysis result for SHA-256 44e657149b979cf0…

MALICIOUS

PDF

82.7 KB Created: 2021-03-16 06:44:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 3a025a88cd2b7963c64a58c047532ac5 SHA-1: 5c8a2ff9c5f7cb2bc3f31c218c222a8db1ccc204 SHA-256: 44e657149b979cf0af4b283f02330b74e1f28afd5371259420885b619ed109b7
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 0.9992

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://kuzutuzo.ru/award?keyword=little+rock+catholic+study+bible+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4465149/normal_6002a785b4329.pdfIn PDF document text
    • http://lekaposo.iblogger.org/broadcast_news_writing_reporting_and_producing_6th_edition.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412160/normal_603c50a194080.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481662/normal_601e1fa0bb214.pdfIn PDF document text
    • https://xezamojukugenu.weebly.com/uploads/1/3/5/3/135316948/tazadevajinop.pdfIn PDF document text
    • https://kogozodibivuf.weebly.com/uploads/1/3/6/0/136094397/lemowivunu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450502/normal_5fc5be316a48f.pdfIn PDF document text
    • https://solorebigaz.weebly.com/uploads/1/3/4/7/134707119/9883847.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8d59741e-369e-44be-b01e-8fbcb09d2d01.filesusr.com/ugd/7cefa9_bd9e5841770f48669fb95412ffc043fe.pdf?index=trueIn PDF document text
    • http://xemaneruweveji.epizy.com/kexuwiguloguj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f7f71b8-84b0-4b63-a0cb-c50e96d1965d/dark_souls_2_scholar_of_the_first_sin_strategy_guide_download.pdfIn PDF document text
    • https://56148a0a-83a3-4003-94ff-78d3044b7c00.filesusr.com/ugd/6f5f23_3d42a74c7f224d42afa6f3b233602539.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1c5d4f3-b8b8-475a-8ea2-0ff7d550d165/63906175696.pdfIn PDF document text
    • https://28481333-1ef2-46fb-8ebf-d56c3f24acbc.filesusr.com/ugd/314c35_57c72ecb9fba4a6d81bfd0e6cd07c38f.pdf?index=trueIn PDF document text
    • http://rajakoxefulume.epizy.com/bobixilogiripajobo.pdfIn PDF document text
    • https://068ba8bc-08b0-4b68-8151-f3c59c7a5775.filesusr.com/ugd/5a4aad_eaeaa12a37714787b82ff53670eeaed1.pdf?index=trueIn PDF document text
    • https://fa53e508-d88d-41cb-897c-7a5b6f1bfcc3.filesusr.com/ugd/361045_4a3babd8f0d448f286d5d2080669ec34.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/86b94ec8-282e-411f-9013-3b9031b07721/cant_connect_to_xiaomi_wifi_repeater.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41e2412d-b125-4353-b918-d9632bd6c470/xodowisetoji.pdfIn PDF document text
    • http://zogutofarori.epizy.com/bootstrap_label_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24cb116e-6095-4a54-9b62-2d14ec25ea71/danun.pdfIn PDF document text
    • https://3745348a-78a0-42d7-8ff4-af2b45bf5faf.filesusr.com/ugd/02631b_d372b486ece042ceafbc6d5277a3ac74.pdf?index=trueIn PDF document text
    • https://8316a071-1c81-4729-bbc9-bb84f51c1359.filesusr.com/ugd/b2ba6b_02412f4623594477990829b13b57d7a8.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA5B 2868 bytes
SHA-256: cfdf59a0cc40cda50b922138463ecaa12fc447e9f282d0131606ef10d6057929
font_01_sfnt_off0001048e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1048E 5492 bytes
SHA-256: a8b0cb049167063739c73b8b00bcae2215224e847eefefbb88c4645aef95ee1e
font_02_sfnt_off0001173a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1173A 10976 bytes
SHA-256: c28fbef905bb110b063cf5a7bab1f9ab0cc2fc9691839c70d7548314795df00f