Malicious PDF — malware analysis report

Static analysis result for SHA-256 d33c8d01d9d52dc1…

MALICIOUS

PDF

77.9 KB Created: 2021-06-03 13:18:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 83b70a8f810e814826288ec68b707e46 SHA-1: 803727ea58a3ac9fe6daa23d636879e2b53e5913 SHA-256: d33c8d01d9d52dc1c3d8b321d5b3e2353846aebf9b7e378ebd66a6124bb5b591
186 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a phishing or scam campaign, indicated by the presence of a large number of external links, many hosted on disposable domains. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest this is an attempt to create a link farm for SEO manipulation or to direct users to malicious content. The ClamAV detection and ML classifier further support its malicious nature, likely serving as a lure for unwanted software downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://infrive.ru/pbw?utm_term=tekken+3+game+download+for+pc+windows+10+apunkagames PDF link annotation
    • https://bapudemajupi.weebly.com/uploads/1/3/1/4/131438294/jojusijomen_rewan_gigowelirinu.pdfIn PDF document text
    • https://sozogamawi.weebly.com/uploads/1/3/1/6/131636736/rafukerenujase-manefokuso.pdfIn PDF document text
    • https://sigakoge.weebly.com/uploads/1/3/4/4/134437147/1799158.pdfIn PDF document text
    • https://rojisubul.weebly.com/uploads/1/3/4/5/134593633/lumevasovaf_jexol_jumokij.pdfIn PDF document text
    • https://minavuxosedixif.weebly.com/uploads/1/3/4/5/134525921/kutazukov.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491432/normal_5fc969dfc0f3e.pdfIn PDF document text
    • https://tatazopizen.weebly.com/uploads/1/3/1/1/131163492/1174020.pdfIn PDF document text
    • https://padipemoton.weebly.com/uploads/1/3/0/7/130739419/9955295.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415300/normal_601bb7d38667e.pdfIn PDF document text
    • https://dapoxegimore.weebly.com/uploads/1/3/0/9/130969679/2944131.pdfIn PDF document text
    • https://ridegagix.weebly.com/uploads/1/3/4/6/134668883/mepuwumapetevugo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497369/normal_5ff5cbf0a8b32.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413570/normal_60583f694026b.pdfIn PDF document text
    • https://foxujutuz.weebly.com/uploads/1/3/4/3/134348357/jafitafigi.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
    • http://buvavipoluvu.pbworks.com/w/file/fetch/144425094/82917365565.pdfIn PDF document text
    • http://jolunatimavu.pbworks.com/w/file/fetch/144505494/ejercicios_con_el_presente_perfecto.pdfIn PDF document text
    • http://togiwuvoze.pbworks.com/f/lopibafabefekuri.pdfIn PDF document text
    • http://jeselivid.pbworks.com/f/engineering_mechanics_dynamics_13th_edition_solutions_manual_free.pdfIn PDF document text
    • http://pazimonofe.pbworks.com/w/file/fetch/144463182/figiv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fef45ca6-4f16-42a4-9600-908d08be2a59/zovobinatotulinef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2eae6339-3858-457b-83be-c66426e2a0dc/is_1100_on_the_sat_good.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ae0d112-8740-4eaa-9d98-95aaa91f3aec/how_to_hard_reset_a_night_owl_dvr.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_off0000e388.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE388 5740 bytes
SHA-256: 84b59e81af7f64f514149bde3f8dbaf0a7fcabf54b8ad60bca68b0475cb979d3
font_01_sfnt_off0000f70d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF70D 10732 bytes
SHA-256: 4ef0ab1b1b6507109e05e29e473db89523770a89842a27c60803b0e926fc2d78
font_02_sfnt_off00011b95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B95 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f