Malicious PDF — malware analysis report

Static analysis result for SHA-256 354927c87222d2ea…

MALICIOUS

PDF

74.9 KB Created: 2021-03-17 06:26:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a2cde638f7f063953082325887d387b8 SHA-1: 2c4717a8cf0484161d30327e2cb0c22d0865d684 SHA-256: 354927c87222d2ea3120e39f6d5b280e0e41b92d06f8066a4346b1c0ba284f73
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 0.9989

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://golowaki.ru/strik?utm_term=usmc+junior+enlisted+performance+evaluation+system PDF link annotation
    • https://pixamowogiru.weebly.com/uploads/1/3/4/5/134590731/71db0622b8c3.pdfIn PDF document text
    • http://busibear.com/8528484571waloh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407997/normal_6047d149d3c18.pdfIn PDF document text
    • http://fimozagori.iblogger.org/how_to_set_up_graco_pack_n_play_changing_table.pdfIn PDF document text
    • https://wewodagib.weebly.com/uploads/1/3/4/2/134266566/195bb64.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403556/normal_604ee1c83912d.pdfIn PDF document text
    • http://safagiko.iblogger.org/bengali_newspaper_ei_samay.pdfIn PDF document text
    • http://kizefet.iblogger.org/kozudojiwigolezemofena.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485448/normal_5fca95b106148.pdfIn PDF document text
    • http://c-advance.space/55179657029ve0uf.pdfIn PDF document text
    • https://jirozonuk.weebly.com/uploads/1/3/1/6/131606844/1509053.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366358/normal_5fed15790f336.pdfIn PDF document text
    • http://themarkuzmusic.com/little_fires_everywhere_going_to_have_a_season_24heze.pdfIn PDF document text
    • http://akb54.ru/25181408326awixg.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/2a221f20-1f4e-4627-ad0c-ca372244428b/zisiwumofe.pdfIn PDF document text
    • https://9526c93a-d340-4dca-b5fd-2864ff0888c4.filesusr.com/ugd/4c3d6a_cfae2b8b06e14df69f6da0690557882a.pdf?index=trueIn PDF document text
    • https://6f1239e7-da96-47bf-8adb-22d47a96a9da.filesusr.com/ugd/bb5a15_ab8b37779e4b4b5894e61941e45f7009.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fbed1d37-295d-4c8b-bbe8-e483f648d259/71093978085.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49d58c77-89d3-411a-8f66-20f9e03c3a79/fenidizenebadifojerunozet.pdfIn PDF document text
    • https://add83a7c-0e31-48b3-928b-061d82ba9144.filesusr.com/ugd/205ae4_bfff6f4561424f50b37637ca7a7f4bb7.pdf?index=trueIn PDF document text
    • https://58f604bd-1fd8-4cfe-af9b-f15e67d030d5.filesusr.com/ugd/9a7439_bb1d3b1d80b14fdc819c24228a24f934.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2528836-3852-4b83-ba13-bf22885e886a/how_long_do_you_microwave_a_hot_dog_in_a_bun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e30cf9c-8a92-4c5c-aaf3-5e808c7960b6/lekigevekurekefelopo.pdfIn PDF document text
    • https://a43ab9c2-5efb-4cee-ac06-b782a0f5e207.filesusr.com/ugd/4826f5_f9fec077f5764fce895d3238254701d2.pdf?index=trueIn PDF document text
    • http://xamorapex.epizy.com/free_correcting_sentences_worksheets.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d84a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD84A 5412 bytes
SHA-256: 5fecd82b3c7eb38f5bf11d5318622a03597ed7c1faa4170eaac7103018ce3598
font_01_sfnt_off0000eaa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA7 11292 bytes
SHA-256: 39683539328d08ad0df255fbc79de45937df9b486774b3200ec313ec4ceea1d7
font_02_sfnt_off00010f5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F5E 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3