Malicious PDF — malware analysis report

Static analysis result for SHA-256 21859182624e6092…

MALICIOUS

PDF

71.5 KB Created: 2021-03-29 00:22:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b6c31dbd2c1353138240f4223c25ed8a SHA-1: aeefd04198b7e68517c21e541bccea1b88e62bf2 SHA-256: 21859182624e6092d434c2c6d5a284c17a56ad2b32b8a3c8afe93782b104f578
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, forming a link farm, and is flagged by ClamAV as a phishing trojan. The document body, though heavily obfuscated, appears to contain search terms related to downloading software, suggesting a lure to malicious websites. The presence of multiple external URIs and the ML classifier output strongly indicate a malicious intent to redirect users.

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://seumenha.ru/wix?keyword=beauty+plus+apk+download+uptodown
    • https://cdn.sqhk.co/zivuronufepu/hC9ngh3/criminal_case_definition_for_dummies.pdf
    • http://converstarget.ru/50454723677jhvnf.pdf
    • https://cdn.sqhk.co/fofateze/2ggLhhq/buriratitavupi.pdf
    • http://mopexaxurip.getenjoyment.net/zopuwewej.pdf
    • https://cdn-cms.f-static.net/uploads/4422386/normal_604cc7548d511.pdf
    • https://cdn.sqhk.co/figegixo/hbhcwjj/vagoxepunizaxani.pdf
    • http://rijunoje.mygamesonline.org/61969974586.pdf
    • https://static.s123-cdn-static.com/uploads/4460954/normal_5fca2f17f250d.pdf
    • https://cdn.sqhk.co/limizolaxa/dTGfahf/free_full_length_comedy_movies_on_youtube.pdf
    • http://busurman.space/what_are_the_latest_lg_phonesxajli.pdf
    • https://cdn.sqhk.co/mukibusu/azBgduk/v_moda_m200_head_fi.pdf
    • http://zoneeuro.pro/903014807pvkpw.pdf
    • http://fogejebimo.scienceontheweb.net/beps_action_5.pdf
    • https://cdn-cms.f-static.net/uploads/4417216/normal_6034cdc4a2fb9.pdf
    • http://trokot-roznica.xyz/50479823971lkto7.pdf
    • https://cdn.sqhk.co/foroboreb/i8THCja/subozosibere.pdf
    • https://cdn.sqhk.co/tazakabebilo/2W5gjS5/love_glitter_full_hd_wallpaper.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://e18e6c05-101e-4f41-9c4d-f518aea09dbb.filesusr.com/ugd/7972b3_c0336e6520034ae5be82b1d4a56a68b4.pdf?index=true
    • https://ab25a8b3-4d80-4d4b-93a1-c1347014fa7c.filesusr.com/ugd/8d0191_f32a513748894d43872cec60db0aef4c.pdf?index=true
    • 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_off0000d0a3.bin
9c11a2a0554afc4aaa8b57a41cb473e4cafe595d3b9a30c148e96d5c87e275d9
pdf-font-stream PDF embedded font (sfnt) at offset 0xD0A3 5164 bytes
font_01_sfnt_off0000e260.bin
a52a58769530b4f99d67ee7d905cac2c7ca12eeed965740f41d74c075a29491f
pdf-font-stream PDF embedded font (sfnt) at offset 0xE260 14680 bytes