Malicious PDF — malware analysis report

Static analysis result for SHA-256 25a4b5e34a8f91e4…

MALICIOUS

PDF

80.2 KB Created: 2021-04-08 00:36:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 46996f70e9301486eafbfc21dc72728c SHA-1: 04e5ad3d16b86fa6d0c7c20c31ca9aae64c67773 SHA-256: 25a4b5e34a8f91e4f5f775226a9cf0c62329892e0b016e21eb1dfecef5eca3e0
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a technique often used for SEO manipulation to distribute malicious content. One of the primary links points to a cracked software download, indicating a phishing or scam attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jottigo.ru/123?utm_term=adobe+photoshop+cs5+crack
    • https://cdn.sqhk.co/besudamuge/xohjzbn/basketball_hoop_swish.pdf
    • https://cdn.sqhk.co/kinanekoxo/agdzdQ1/megematulokos.pdf
    • http://bestrongbyg.com/how_to_vote_avakin_life_as_game_of_the_year_2020u78in.pdf
    • https://cdn.sqhk.co/wofunukasu/hcihigo/sedige.pdf
    • https://cdn.sqhk.co/bexamajuw/7jcU5Ko/time_traveler_s_wife_sequel.pdf
    • http://esplus.pro/pukeget06x5b.pdf
    • https://cdn.sqhk.co/zibomevuguli/R3ifggW/codigo_procesal_civil_y_mercantil_decreto_107_guatemala.pdf
    • https://cdn.sqhk.co/tuxonewebuke/JpOhfzv/across_age_2_mod_apk.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://rigitusavogu.epizy.com/metformina_500_para_que_sirve.pdf
    • https://12dd324c-696b-4d67-8c19-991f3eacec2c.filesusr.com/ugd/eeb7bd_75ac390c05b342d78b1b6f145bb33e48.pdf?index=true
    • http://wagibederujejo.rf.gd/exercise_for_flat_tummy_in_7_days.pdf
    • https://s3.amazonaws.com/zabevog/celestron_skyportal_wifi_module_amazon.pdf
    • http://borovob.epizy.com/waste_management_recycling_list.pdf
    • https://1682489e-d94b-4f22-b6a6-c8ecb623ca2e.filesusr.com/ugd/5f226e_868dd441d7d24238a105c5c504441142.pdf?index=true
    • https://s3.amazonaws.com/lomuper/44387928791.pdf
    • https://s3.amazonaws.com/fikuvine/difogazirilif.pdf
    • https://s3.amazonaws.com/tixedujegibex/21219111119.pdf
    • http://nifagusimesizi.epizy.com/adobe_premiere_pro_apk_free.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fca9.bin
e38f6c0357fcc006f85cdebcd579dfc0ee43879b760f0914d2fdec2ef2d6d322
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA9 5448 bytes
font_01_sfnt_off00010f2b.bin
b92b220c539ee05455e1428382c3e9eb73efe2d41739a46d4fd88a4bf6abd489
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F2B 10732 bytes