Malicious PDF — malware analysis report

Static analysis result for SHA-256 71869c3208fed7c7…

MALICIOUS

PDF

90.4 KB Created: 2021-02-20 19:40:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: d0ae595545f6c65e1a6bd501d7ecb8b0 SHA-1: 6d5bd9fdee18dd4a54a1169cd8d732481eda2c68 SHA-256: 71869c3208fed7c7e83d2c01c3308d64c562918fcd7f55a8cfb393531d56c533
134 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many pointing to disposable hosting and forming a link farm, which is a common tactic for distributing malware. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or trojan delivery. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to trick users into downloading a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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
  • 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://seumenha.ru/wb?keyword=problem%20and%20solution%20text%20structure%20powerpoint PDF link annotation
    • https://nonaxoboru.weebly.com/uploads/1/3/4/4/134467623/fugemus-wezekekasesu-rafiz.pdfIn PDF document text
    • https://cdn.sqhk.co/noxibogalu/if1G256/mountain_climb_4x4_apk_hack.pdfIn PDF document text
    • http://dietnatur.fun/acc_aha_hypertension_guidelines_20197pvrj.pdfIn PDF document text
    • http://legendbilisim.com/acetic_acid_forms_dimer_in_vapour_phasedp1n7.pdfIn PDF document text
    • https://cdn.sqhk.co/fofasafiwi/SeeAkFy/bubajamug.pdfIn PDF document text
    • http://quickstore.pro/bad_piggies_mod_unlimited_everything_ios4rscv.pdfIn PDF document text
    • https://cdn.sqhk.co/fowijuseziju/ih7OjaL/space_warriors_watch_online.pdfIn PDF document text
    • http://shopbest.online/32363449716kl38c.pdfIn PDF document text
    • http://podcard2020.site/xiberumowetil6m6e6.pdfIn PDF document text
    • http://insurancesouk.com/2293753352zrk31.pdfIn PDF document text
    • https://xumizobizuzu.weebly.com/uploads/1/3/4/6/134688834/nijeperepurajevi.pdfIn PDF document text
    • https://fimedezederuru.weebly.com/uploads/1/3/4/8/134884956/621acdf69019.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://kazowaz.rf.gd/manualidades_super_originales_y_faciles.pdfIn PDF document text
    • http://mejefelutirarej.epizy.com/chimera_5e_monster_manual.pdfIn PDF document text
    • http://vovajixavago.epizy.com/jitetasufazovore.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A3 6440 bytes
SHA-256: edf517a561ed5132c6c1d5718ac6ff9d870a00e6f43a91762fd168a2279cca75
font_01_sfnt_off00010099.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10099 5404 bytes
SHA-256: 7eff923923122560c173a1ad03328e576ad79101c2aa54a6ca591fe0ea9806d4
font_02_sfnt_off000112e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112E1 11148 bytes
SHA-256: 6cbb7368b6a53f97cc5e09687e8182f47dead9f86b67f269e6b16813efebe318
font_03_sfnt_off00013912.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13912 16036 bytes
SHA-256: 149cab45689013e99d1aa520d2e5234663aa5d8577b6aae5e423b5d60aeda4c1
font_04_sfnt_off00014d7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D7A 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3