Malicious PDF — malware analysis report

Static analysis result for SHA-256 b873d26e97a81afb…

MALICIOUS

PDF

124.9 KB Created: 2021-05-09 03:56:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 1c3658763537375877b26a1375f279d9 SHA-1: af6e1332242eb2fb8008c3199d9bf58d16e1f01c SHA-256: b873d26e97a81afb513a68665df1923c1f21c800a1f126993a5ee54b0deb9829
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 0.9993

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://xezojetit.ru/strik?utm_term=samsung+un43j5200af+manual PDF link annotation
    • https://cdn.sqhk.co/detokelixipi/Fyhgica/67162223546.pdfIn PDF document text
    • https://cdn.sqhk.co/wubunepan/jieqMZq/92316197497.pdfIn PDF document text
    • https://cdn.sqhk.co/jepogedofuz/hcOxhgZ/galawawidaxi.pdfIn PDF document text
    • http://vorakumezaxof.mygamesonline.org/kofilitalanuxiz.pdfIn PDF document text
    • https://cdn.sqhk.co/bujasugawo/K0Phdia/72966950472.pdfIn PDF document text
    • http://bebetadiruj.mywebcommunity.org/nibuz.pdfIn PDF document text
    • https://cdn.sqhk.co/ziriziwebu/UyghsCe/sulejugefonakamilobox.pdfIn PDF document text
    • http://poposiruta.mywebcommunity.org/jubetisowilenupanig.pdfIn PDF document text
    • http://wujejejifi.mygamesonline.org/25064281394.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wutezigojuxi/82538198643.pdfIn PDF document text
    • http://bugutanokunaliv.rf.gd/makalah_invertebrata_dan_vertebrata.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxexi/gevulode.pdfIn PDF document text
    • https://51bf459c-6b46-41b0-863f-532cf8a77e0d.filesusr.com/ugd/2eedf1_c8cb3030fb364a3db298c5161f9f0a78.pdf?index=trueIn PDF document text
    • https://9fb0fece-6c2a-4f8b-8ff1-5d9ea67f5ee7.filesusr.com/ugd/f6a907_fab1a391c94b4e07b4b26740a5cfdc02.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tevigotu/badmash_song_b_karm_khazala.pdfIn PDF document text
    • https://e905a76e-7bc1-418c-be29-e8eda1603e86.filesusr.com/ugd/3fb32a_675d407279b04ac2988a1b84b9f441a0.pdf?index=trueIn PDF document text
    • http://relisedozoru.epizy.com/kimuxabiletowisexe.pdfIn PDF document text
    • https://s3.amazonaws.com/solonebosop/tareekh_ibn_kathir_english.pdfIn PDF document text
    • https://s3.amazonaws.com/vuterijoze/50784656914.pdfIn PDF document text
    • https://s3.amazonaws.com/gekixadonuru/glossary_of_terms_template.pdfIn PDF document text
    • https://235be7ff-9b22-41de-91df-7a9e5ced5199.filesusr.com/ugd/4fa465_f9215213097f4d0d8c2c5bdb98caf8d5.pdf?index=trueIn PDF document text
    • https://2b4b9a66-705d-4e40-a31d-28d4db190467.filesusr.com/ugd/1dbb98_cf3fc41fc22c4700a0de13764ef0931f.pdf?index=trueIn PDF document text
    • http://romutipi.rf.gd/who_assesses_the_safety_hazards_in_the_workplace.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001925d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1925D 5820 bytes
SHA-256: c8805265700da391bf0f16c9effcd2bb4978f07dae6ac42fbf073eb7ebbaf09b
font_01_sfnt_off0001a630.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A630 12064 bytes
SHA-256: 6dc0612eb27802a7ab7efc51067ca4e573e52bad148f34e09fd1e7fed9841923
font_02_sfnt_off0001cf9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CF9A 16456 bytes
SHA-256: 39d8fc75b01c420c23d87206f27307ee77f50d6a80e21d6af1f727a483fdac4b