Malicious PDF — malware analysis report

Static analysis result for SHA-256 3075ef09a3ec868a…

MALICIOUS

PDF

83.1 KB Created: 2021-03-06 09:48:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 676a8ab1d62e3654878d69d22bbaf882 SHA-1: 280594499a120a5559c45d4081d34f186ea91af0 SHA-256: 3075ef09a3ec868a6a9a5fb495722ca546706c7206d4cc30a38e3a731ca94df6
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM' suggesting a large number of outbound links intended to manipulate search engine results or direct users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://druttle.ru/wix?keyword=skills+practice+lab+reactivity+of+halide+ions+answers
    • https://cdn.sqhk.co/gaxozamikoge/fjbPRbk/bollywood_song_flute_ringtone_zedge.pdf
    • https://cdn.sqhk.co/mipijotom/eFr2hif/guess_the_movie_quiz_daily_challenge.pdf
    • https://cdn.sqhk.co/savageven/caAiaUq/dallas_police_officer_killed_2020.pdf
    • https://cdn.sqhk.co/vizinifum/aicGqgi/nazobo.pdf
    • https://cdn.sqhk.co/safubuguva/zpjeIjr/sonepegoginazopotukaxotir.pdf
    • https://cdn.sqhk.co/vepefilome/iqhgH53/dimilijulilataxulugikive.pdf
    • https://cdn.sqhk.co/jidulopavoji/cQcih1R/usac_president_twitter.pdf
    • https://cdn.sqhk.co/bupabumo/fghOgis/app_lock_for_android_tv_apk.pdf
    • https://cdn.sqhk.co/vefemonuru/iehrjib/best_camera_app_for_lenovo_laptop.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/69917634-cb41-47e0-9763-b9ef8aa79752/spirit_run_game_download_apk.pdf
    • https://uploads.strikinglycdn.com/files/2eabb1db-a205-43f0-8c5e-52d9a5ac155d/32935538590.pdf
    • https://9907981b-0bc7-4fd3-a434-169f7cdadf42.filesusr.com/ugd/575363_e6db77d3044c4a2f9f013209d9780441.pdf?index=true
    • https://dd907c4b-492b-4b4d-bf3c-9f0b7a2bd2c7.filesusr.com/ugd/96a426_da0debfe7a254dc4a2a9f699b578c96e.pdf?index=true
    • https://a1c9bafd-2917-4c1b-b79c-a4b44a941470.filesusr.com/ugd/f0f215_e67ee6e2fe06406795aaf925852074ec.pdf?index=true
    • https://ed59cdd8-0d75-4634-8bb2-7afdb9da103e.filesusr.com/ugd/9cb112_80a4e721ab224a1795d7cdba0145c4b2.pdf?index=true
    • https://1423d76f-a56f-4481-bf87-726e17039346.filesusr.com/ugd/14aee2_c4fcdc5e4ca042a6a8faec66ab04f542.pdf?index=true
    • http://tasenos.epizy.com/bonavunuke.pdf
    • https://uploads.strikinglycdn.com/files/99e9c875-155f-4ac0-b796-70ee26a959ac/83650382633.pdf
    • http://fesenobonirizu.epizy.com/14540793993.pdf
    • https://4a1cfc67-5981-466d-a13b-75576fe7431f.filesusr.com/ugd/64e449_7044569c9fd14387801ce1e18897de6f.pdf?index=true
    • https://5c09c65f-4728-49e3-9562-8692e696fc4f.filesusr.com/ugd/32acb1_a6d1ae1ac83f45d2bd001a407150a06b.pdf?index=true
    • https://uploads.strikinglycdn.com/files/e8bb9cef-3feb-421d-913b-975a18e42eb6/which_way_to_put_turkey_in_big_easy.pdf
    • https://uploads.strikinglycdn.com/files/034ee9a8-8147-423c-bc63-35bda249d40c/bezazomexapinotefemete.pdf
    • http://rojugukilajix.epizy.com/pigov.pdf
    • https://aed022ca-8a9d-452d-9022-56a74a585a14.filesusr.com/ugd/4d548e_8c747cbfac594776a7793933e3ac0e48.pdf?index=true
    • http://tiwobera.rf.gd/savurasisusorusabove.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa1d.bin
10325c1dc54ba258135873d7326fdf0758e3373312f0d1777e5f6b4de2fb197d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA1D 5592 bytes
font_01_sfnt_off00010d17.bin
01a4e9be80821346cefb11900dad23e8097a800a1e0c036716ea348baee56c50		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D17 10288 bytes
font_02_sfnt_off00013041.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13041 4324 bytes

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