Malicious PDF — malware analysis report

Static analysis result for SHA-256 8495e03069f3f6c7…

MALICIOUS

PDF

84.1 KB Created: 2021-03-29 17:16:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 843c022a00dd3b8eb137e735a2ec8960 SHA-1: e25b2bfedd7951de7935dee25ba2afdf71858368 SHA-256: 8495e03069f3f6c777dd839f117d0cfa71389ce6911fd690e84a51bc594e993e
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, indicating it functions as a link farm. Heuristics like 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest this malicious intent. The ClamAV detection and ML classifier further confirm its malicious nature, likely related to phishing or SEO spam. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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=ji+suk+jin+son PDF link annotation
    • https://cdn.sqhk.co/detatakev/p7iiZif/wumojijamitadogezulidaku.pdfIn PDF document text
    • https://cdn.sqhk.co/fiporalisu/WPbghoZ/xawegimegegunafetenivemod.pdfIn PDF document text
    • https://cdn.sqhk.co/texivewa/iuibjee/runonurexakilazinebat.pdfIn PDF document text
    • https://suluxeposinugu.weebly.com/uploads/1/3/4/6/134634013/jixejoz_piworatapopenip.pdfIn PDF document text
    • https://cdn.sqhk.co/notenirikev/V6ANghB/ditto_looper_pedal_guitar_center.pdfIn PDF document text
    • https://cdn.sqhk.co/wubunepan/jLgijaE/futegozuwilusaw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483604/normal_5fe9e1b35053b.pdfIn PDF document text
    • https://cdn.sqhk.co/danajuva/X39ifiG/afterburner_game_ps4.pdfIn PDF document text
    • https://cdn.sqhk.co/luwiwaduna/gig2ojh/podafubotanon.pdfIn PDF document text
    • https://cdn.sqhk.co/tazewupo/hfqkKxb/54248128518.pdfIn PDF document text
    • https://dinijituwit.weebly.com/uploads/1/3/1/6/131606252/tuxore.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381344/normal_60364bbacfb8f.pdfIn PDF document text
    • http://sixawuragime.iblogger.org/minecraft_mobestiary_book.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470692/normal_603b5dfb9a5af.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417429/normal_605c95e3a2fb8.pdfIn PDF document text
    • https://tolajugim.weebly.com/uploads/1/3/4/6/134647220/b3717.pdfIn PDF document text
    • https://cdn.sqhk.co/lididiregi/ihBjigd/lepajipebibovidofonem.pdfIn PDF document text
    • https://cdn.sqhk.co/jukusenefow/zjeB1Gk/walumabiwepefugag.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gufolisalowu.rf.gd/50034498676.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1138cc5c-4028-4019-aa09-0fd8e39da3c9/cygolite_hotshot_50_l_rear_light_bulb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cac4c192-45ac-49fe-acb5-4023cb8f9c4b/21182162363.pdfIn PDF document text
    • http://rukitugelonodov.rf.gd/60387712538.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f83b0c7-4fb6-48e8-a596-9d818142f2d4/best_second_hand_car_buying_app.pdfIn PDF document text
    • http://bexudigibop.rf.gd/25308626778.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_off0000edb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB4 8676 bytes
SHA-256: 5e0e24d4173b806ee09eceac1044993229be019f4d70935d1686a0ab1da0a14a
font_01_sfnt_off00010a00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A00 4468 bytes
SHA-256: 8546e23a52f363fee88241c12e62287554d4abf003bbd9769079aeaf4dae3bf8
font_02_sfnt_off00011952.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11952 12260 bytes
SHA-256: b00223917b7f9ae69b6356a263317f56017ad5da7c75d98279239b7a81dca0f0