Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab581d779606e0fa…

MALICIOUS

PDF

78.5 KB Created: 2021-03-14 14:10:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: bb8048fc7d307a455f0407c791b89f41 SHA-1: fc0f44c681e3eed6dd2f4b67e51dc7ae8da8e73d SHA-256: ab581d779606e0fa71dd5f8d2d17f6cc5694326fbcfa63d30d47d15873171c35
252 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many of which are hosted on disposable domains and appear to be part of a link farm designed to attract users searching for cracked software. The presence of a 'download' button lure and the critical heuristic firing for a malicious redirector link strongly suggest a phishing or malware distribution attempt. The ClamAV detection further confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://dafemum.ru/wix?keyword=adobe+cs6+mac+crack+download In PDF document text
    • https://cdn.sqhk.co/pafevola/idgftii/nvidia_shield_4k_hdr_gaming.pdfIn PDF document text
    • https://cdn.sqhk.co/mutexeze/jfDAUgc/heavenly_sword_dragon_slaying_saber_cast.pdfIn PDF document text
    • http://winoraama.space/what_is_iata_and_icao_codes9fv2h.pdfIn PDF document text
    • https://cdn.sqhk.co/sejixikerut/Ojhieib/fit_the_fat_2_new_game.pdfIn PDF document text
    • http://stav-games.ru/72321360800ovmp3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427268/normal_5ff1f7c1c0960.pdfIn PDF document text
    • https://cdn.sqhk.co/gapekozuwa/jiyvq9I/block_poster_kleurplaat_sinterklaas.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460465/normal_60182c7b74b46.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464532/normal_603f2179b1803.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423452/normal_6044cbcdcb438.pdfIn PDF document text
    • http://mestorating.ru/wagevudowibevazze42.pdfIn PDF document text
    • http://uuuuull.space/95822974667zcccl.pdfIn PDF document text
    • http://disojunis.iblogger.org/battin_astrodynamics.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408720/normal_6036acc91a60c.pdfIn PDF document text
    • http://lnstagramverifiedsbadgesforms.com/what_is_smart_tv_and_android_tvvdx96.pdfIn PDF document text
    • https://cdn.sqhk.co/sigidezok/sihhbjj/strike_2_goal_fantasy_soccer_league_2019-_20.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483856/normal_604d9892f1b01.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e0220c8c-c322-4c33-af83-7c5b0fe00b66.filesusr.com/ugd/a771bd_b7b5bc5cf2a44bd8b23942f21247928e.pdf?index=trueIn PDF document text
    • http://toxuvadamutetix.rf.gd/drawing_books_for_tattoo_artist.pdfIn PDF document text
    • https://f87ce62f-3d5d-4c42-bff3-2e7d00444551.filesusr.com/ugd/72ed28_3ccd656d4a5347fda76748abac654699.pdf?index=trueIn PDF document text
    • http://rijujala.epizy.com/how_long_does_the_bardo_state_last.pdfIn PDF document text
    • https://96a9e3af-f0c3-4048-9e6c-0ad8da3c6018.filesusr.com/ugd/15d534_8203fcc806614239849ec0a73d0521f8.pdf?index=trueIn PDF document text
    • http://gazezubutajon.rf.gd/gipanotiwetaroxenitebiseg.pdfIn PDF document text
    • https://1a447ccf-a6a5-490c-ad31-399ae8169532.filesusr.com/ugd/cf5184_3d0c7b076c4045a8accb237ec33e5550.pdf?index=trueIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f247.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF247 5524 bytes
SHA-256: 6853d57c18fef83f8c4a9f52ca74ec81b19834b340e33c1022fa51bbf0b30d4f
font_01_sfnt_off00010509.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10509 11208 bytes
SHA-256: 82988de56dc216fb60016dc3bd0fca627ad1ef7acb39b4e3010f9de6c2d2dd3e