Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ac860f4b9d839bc…

MALICIOUS

PDF

79.2 KB Created: 2021-03-08 11:11:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: c1c7e7a05a1772fccc8bfbfaabc058ac SHA-1: 5e465519255bbf979bbeaa64b1878c72143470f8 SHA-256: 4ac860f4b9d839bc68f44075bee50f35808ccacbc9258da2f8b9561e8aa92bd1
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, indicating a phishing or link-farming attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious content or phishing sites. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document designed to exploit users via embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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 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://lozipotod.ru/wix?keyword=senior+seminar+topics+in+biology PDF link annotation
    • https://cdn.sqhk.co/jasurisunav/gccgdgh/indoor_swing_chair_with_stand_price.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426832/normal_600cf6cdd39d1.pdfIn PDF document text
    • http://senteber.site/judy_garland_have_yourself_a_merry_little_christmas_2_lyricswri8d.pdfIn PDF document text
    • https://cdn.sqhk.co/riroxale/gifjiqY/datokagatajaxubusatotupif.pdfIn PDF document text
    • http://fobativ.mywebcommunity.org/58756453566.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485939/normal_5ffc4a91345c1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469836/normal_6016c3622bd5b.pdfIn PDF document text
    • https://cdn.sqhk.co/sejixikerut/Qi6hclV/castle_clicker_chest.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425227/normal_603e7bc9b1377.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384633/normal_5fd66097c4aef.pdfIn PDF document text
    • https://cdn.sqhk.co/sarunasol/gcVjae0/51052583084.pdfIn PDF document text
    • https://cdn.sqhk.co/lazemowul/gigitSH/neririsox.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450625/normal_6033e0c46bf73.pdfIn PDF document text
    • http://afracheat7.xyz/68887003353doiuk.pdfIn PDF document text
    • http://xodaxedepapopox.mygamesonline.org/xibet.pdfIn PDF document text
    • https://cdn.sqhk.co/noxisoture/dh4ieig/52077722111.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455178/normal_5fdff02b4a8bd.pdfIn PDF document text
    • https://cdn.sqhk.co/firijanab/jaidhdD/wifi_analyzer_free_download_for_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/gusoguribus/kiegcja/chess_openings_for_black_explained_free_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485693/normal_5fe0a65800f27.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426690/normal_6035ccefb6210.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://gixarewujedel.atwebpages.com/28417846234.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_off0000ebe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE8 5388 bytes
SHA-256: 62820051dfc39c48a29c6b8ef076805462478eabd3baf44b9d78dbbdcab22f00
font_01_sfnt_off0000fe0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE0E 10324 bytes
SHA-256: 88c7d9180b477e85435ec273b965bfa70b856d00353778481b9f20e8cefd1b0b
font_02_sfnt_off0001212e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1212E 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c