Malicious PDF — malware analysis report

Static analysis result for SHA-256 74fc87044ca18bdc…

MALICIOUS

PDF

111.9 KB Created: 2021-03-04 17:44:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 04fced8e8428549547ad5690b0e7281a SHA-1: b223545a2b4c774bdabedfedfa2ffe3afe31e683 SHA-256: 74fc87044ca18bdc50fc497227ca8337dddd66305ed7cd9fb55e1661a066afba
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a significant number pointing to disposable domains and potentially malicious content, as indicated by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The ML classifier and ClamAV detection further support its malicious nature. While no scripts were directly extracted, the structure suggests it's designed to redirect users to malicious sites, likely as part of a phishing or SEO spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8543

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://soxebez.ru/award?keyword=what+does+the+rising+sun+mean PDF link annotation
    • http://raisinshub.pro/sda_church_close_to_me42snf.pdfIn PDF document text
    • https://cdn.sqhk.co/rabataxuvax/injeibl/724_stg_eod.pdfIn PDF document text
    • http://websporizle3.com/pixeporuzevqmbg.pdfIn PDF document text
    • https://cdn.sqhk.co/letopoto/FIsMNih/jowubi.pdfIn PDF document text
    • https://cdn.sqhk.co/wifopuzuxiba/vfBhgge/gutschein_media_markt_online_bestellen.pdfIn PDF document text
    • http://finonit.mypressonline.com/50743357163.pdfIn PDF document text
    • http://strahuemsya.info/6337768041px6dd.pdfIn PDF document text
    • https://cdn.sqhk.co/tolononof/qhcjhTk/vezaxuso.pdfIn PDF document text
    • http://ligalirulal.22web.org/58449284187.pdfIn PDF document text
    • http://ontrade.top/40582826066o2p2x.pdfIn PDF document text
    • http://optamorem.com/mitupediwogonabefatocp111.pdfIn PDF document text
    • http://kirakexig.mypressonline.com/diary_of_a_wimpy_kid_rodrick_rules_book_summary.pdfIn PDF document text
    • https://cdn.sqhk.co/zikufivol/fCifjkx/litupudutijiwerewetijo.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://9e1b5e4e-b4ab-405b-8fdf-b3b6d7b19c28.filesusr.com/ugd/94ea38_51149d0779de417ea183fbf22a757cc9.pdf?index=trueIn PDF document text
    • https://dcc20dec-0195-4543-b617-cfb82efd15f0.filesusr.com/ugd/30ea26_671d7d876df643359e6157b48061910e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d103504-844f-43d2-ad82-72d35d60cbe8/how_to_get_auto_repair_license.pdfIn PDF document text
    • https://033a7475-7ccb-45c1-8f1e-38fd320d48d0.filesusr.com/ugd/03a576_398f8360d16749b1a691761327547b2e.pdf?index=trueIn PDF document text
    • https://ea7788ad-ef5a-48b5-911d-3ad522045378.filesusr.com/ugd/f3bfbb_521d6fd5ece64eefaa5c6e52aaa53b7a.pdf?index=trueIn PDF document text
    • https://fb7bf4c5-056f-4058-a7d1-073478569b53.filesusr.com/ugd/d90490_0bf0fb39bc9b49a1998993305f8edf98.pdf?index=trueIn PDF document text
    • http://fugufaza.myartsonline.com/ingersoll_rand_ssr_ep_150_air_compressor.pdfIn PDF document text
    • http://namepafubi.atwebpages.com/64961869449.pdfIn PDF document text
    • http://pasexojubil.epizy.com/how_to_identify_a_marvel_schebler_carburetor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/833bb644-3110-4454-b5d9-23daa886ce68/93660096376.pdfIn PDF document text
    • http://perexuwofogefo.onlinewebshop.net/how_to_reset_esi_phone_system.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012c61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C61 23184 bytes
SHA-256: 9b3f50fa74defdf882c0733ef477fde66f21b3f03d75c2bb3a71b07fe7c96d05
font_01_sfnt_off0001760d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1760D 5104 bytes
SHA-256: be28e4c586235f355000808d779aed299ccd12fec357d0e27cfeccc027b6d58e
font_02_sfnt_off0001873f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1873F 10572 bytes
SHA-256: aed5448f3aafd85fd0ea7d6a2b2e986d8e64ac06885d57181787f90bf455f366
font_03_sfnt_off0001ab96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AB96 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378