Malicious PDF — malware analysis report

Static analysis result for SHA-256 860cc8d1c98029b2…

MALICIOUS

PDF

77.6 KB Created: 2021-03-24 03:49:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 6221062485213990a051a7c8670c1795 SHA-1: 45b5c75ccb78043298eca8ec206bb151fca6a732 SHA-256: 860cc8d1c98029b29c9afcaa93bedbfec8da8a10f0e5b4fcbf8abae59a97d1ab
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, many hosted on disposable domains, characteristic of a link farm or phishing operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to malicious sites or download further payloads. No scripts were extracted, but the PDF structure and numerous URLs suggest a phishing or SEO poisoning attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://resalured.ru/wix?keyword=adding+ing+to+verbs+exercises+pdf PDF link annotation
    • http://afracheat7.xyz/81377353385u1sgx.pdfIn PDF document text
    • https://bopupuvi.weebly.com/uploads/1/3/1/6/131636777/luramomon.pdfIn PDF document text
    • https://cdn.sqhk.co/nivunufozub/hIzkugf/guardian_tales_lazy_fairy_quest_world_1.pdfIn PDF document text
    • http://phulop.store/is_canon_1000d_a_good_cameray48qo.pdfIn PDF document text
    • https://cdn.sqhk.co/gopuxipo/jgdgfib/gunship_force_battle_of_helicopter_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/zetoreli/h4idigo/railroad_tycoon_3_economy.pdfIn PDF document text
    • http://gratoraama.space/marvel_movies_in_order_to_watch_themx5bda.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/jjgcjiX/bluestacks_hd_app_player.pdfIn PDF document text
    • http://load-bcp.com/free_survival_games_pc_no_downloadbjfd5.pdfIn PDF document text
    • https://cdn.sqhk.co/ruradavi/giV6Lvr/granny_mod_menu_outwitt_download_latest_version.pdfIn PDF document text
    • http://trynon.xyz/bolukigubotamagoveji5vt.pdfIn PDF document text
    • http://jushq.club/passport_renewal_application_form_uk7wr9a.pdfIn PDF document text
    • https://tulosiwawi.weebly.com/uploads/1/3/5/3/135326734/befiroz_rakenawawik.pdfIn PDF document text
    • http://lnstagramverifiedsbadgeforms.com/997231115667e42e.pdfIn PDF document text
    • https://sepuzudagek.weebly.com/uploads/1/3/5/3/135329554/32f29f4c8d.pdfIn PDF document text
    • http://aduo5.online/5g_mobile_and_wireless_communication_technologynkb57.pdfIn PDF document text
    • https://viwefinorix.weebly.com/uploads/1/3/0/8/130813514/5340890.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
    • https://s3.amazonaws.com/wamatasamegu/stihl_hedge_trimmer_hs45_battery.pdfIn PDF document text
    • https://s3.amazonaws.com/sikuva/maths_book_for_class_8_ncert.pdfIn PDF document text
    • https://s3.amazonaws.com/jubiferekaka/audio_technica_at-lp60bt_belt_drive_bluetooth_turntable_-_white.pdfIn PDF document text
    • https://s3.amazonaws.com/sinamozagemoger/how_do_i_form_an_llc_in_louisiana_for_free.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_off0000df3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF3C 5128 bytes
SHA-256: 3c4ad00fb14c5a5adbf8e06b263fca0848b05b81441c46d9b539866d560230bf
font_01_sfnt_off0000f0bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BD 11884 bytes
SHA-256: fa2e03d6d79e49df61aa1bbacf85852eb34750955880fabed276339875e13106
font_02_sfnt_off0001193c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1193C 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71