Malicious PDF — malware analysis report

Static analysis result for SHA-256 475bdf33439addf4…

MALICIOUS

PDF

88.1 KB Created: 2021-02-17 21:29:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 970c73521a10320610d5af835dcc02f0 SHA-1: 26d01f4a98f7aa76cdcdadc7445b553d8a7b3677 SHA-256: 475bdf33439addf47fc7e5c9fec7261afee1e277216de932e085611e2da8c1dd
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many pointing to disposable domains or link farms, indicating a phishing or SEO manipulation attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the presence of numerous URLs suggests a redirection chain designed to lead the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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.
  • 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://jacksth.ru/wix?keyword=green+sturgeon+range PDF link annotation
    • https://cdn.sqhk.co/ropimipaf/RBgjAro/shadow_fight_2_shadow_vs_ninja_fighting_games.pdfIn PDF document text
    • https://cdn.sqhk.co/sowumavag/aiix5gj/10815678073.pdfIn PDF document text
    • http://xtreme-sport.ru/lagolua9lzq.pdfIn PDF document text
    • https://duzonaxur.weebly.com/uploads/1/3/4/0/134012347/9272381.pdfIn PDF document text
    • http://creditscorerepair.info/ludoladezidagodo9tc9u.pdfIn PDF document text
    • http://fixmarker.fun/limitless_movie_download_in_dual_audioikio5.pdfIn PDF document text
    • https://cdn.sqhk.co/keropolor/ghy4gDg/xizeluzotexileje.pdfIn PDF document text
    • https://cdn.sqhk.co/xataruzepape/dg0dibu/sms_ringtone_funny_mp3.pdfIn PDF document text
    • https://cdn.sqhk.co/migazajigum/Qrjejig/25710418913.pdfIn PDF document text
    • https://nonelugo.weebly.com/uploads/1/3/0/7/130775267/delusu.pdfIn PDF document text
    • https://cdn.sqhk.co/zugeketinog/f2aL2hd/easy_fried_cod_fish_recipes.pdfIn PDF document text
    • https://tulopudegiwidal.weebly.com/uploads/1/3/0/7/130739196/dea3bd64c4f4833.pdfIn PDF document text
    • http://rostov-mobile-doctor.ru/impossible_quiz_43_answerdbpdn.pdfIn PDF document text
    • http://chambrehub.xyz/36804567873zynwz.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://zerakunutage.epizy.com/41717953599.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_off0001124c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1124C 4688 bytes
SHA-256: 1ce88b8ceb280a29bbd9d61f7b80673fec2faa920641a35732423da5fe9ed09b
font_01_sfnt_off00012241.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12241 10260 bytes
SHA-256: 8b70b8b45212bfa97901e768cdc19fa5a1941a66019c358cbd25fb15f7fac403
font_02_sfnt_off0001456b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1456B 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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