Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cb97679c042fdf7…

MALICIOUS

PDF

89.2 KB Created: 2021-06-01 12:21:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: bb57abd9649606c83a5d8d586f0c52c9 SHA-1: a3fcb09ef50e761dd2023bfa25a98feebee19305 SHA-256: 5cb97679c042fdf7dcb355c15af1770036fb8023e040ae35b64c0cec67b14abd
194 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/123?utm_term=esp8266mod+datasheet+english PDF link annotation
    • https://vefimewake.weebly.com/uploads/1/3/4/6/134649301/varuri.pdfIn PDF document text
    • https://lifezudo.weebly.com/uploads/1/3/0/7/130739479/9035166.pdfIn PDF document text
    • https://duxuxivet.weebly.com/uploads/1/3/5/3/135329622/831dc92a.pdfIn PDF document text
    • https://gakuwalexutibok.weebly.com/uploads/1/3/4/3/134332976/jewakok.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://wuxikadafi.pbworks.com/w/file/fetch/144416697/how_to_remove_instagram_stickers_from_someone_elses_picture.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23d1d82d-d6ef-4674-b904-1a41599e71a7/27239344523.pdfIn PDF document text
    • http://zilebunod.pbworks.com/f/28918924617.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4381bb54-d422-4f91-aefc-18d6c31e3d55/python_snake_game.pdfIn PDF document text
    • http://kufavuva.pbworks.com/f/zinevafebatub.pdfIn PDF document text
    • http://gediripu.pbworks.com/f/what_is_serology_testing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d26e3b6-a40b-43d8-895f-cac80379f5da/9481681007.pdfIn PDF document text
    • http://zeladejan.pbworks.com/f/what_temperature_do_you_put_a_ham_in_the_oven.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9198d255-f967-439c-8fe3-c0972243c992/86228315465.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ced76786-b6e3-469a-b759-9f7f6a844dfa/what_ingredients_to_avoid_for_gluten_free_diet.pdfIn PDF document text
    • http://funinupun.pbworks.com/w/file/fetch/144418047/43533317691.pdfIn PDF document text
    • http://betosaxugawi.pbworks.com/w/file/fetch/144449280/tv_dish_multi_switching_adapter.pdfIn PDF document text
    • http://siruzosu.pbworks.com/w/file/fetch/144436203/57081083820.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80413731-732d-4448-816a-aec479d9c454/siximolo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2cc3ff96-6e5b-418b-b03e-6459c1668126/unity_point_pediatrics_urgent_care_cedar_rapids.pdfIn PDF document text
    • http://kokoxudalux.pbworks.com/f/encyclopedia_judaica_vol_21.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/794a0bd1-11c5-47c7-bae6-aa258e508244/xenejozox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7751062d-4b87-4a62-8cc1-37761ba8b521/35920248255.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49efd58b-74b4-47c5-8658-a9dc02e1d2fb/rv_water_heater_parts_diagram.pdfIn PDF document text
    • http://jesababa.pbworks.com/f/iso_14001_internal_audit_checklist_xls.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000102c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C2 5500 bytes
SHA-256: a149c0f58fcf6f4cfd09631da3706877b1f0a3920755cda20194bf3070a5ca04
font_01_sfnt_off00011547.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11547 2060 bytes
SHA-256: ad9310b33fe22aec2e2be110e004f2258790849060d9901cd6ae60153916d9c6
font_02_sfnt_off00011e32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E32 12620 bytes
SHA-256: 598703e9defbd49a42788f0c0c7aa86c18b37aadca5c6a06b8a8554c5b3f3883
font_03_sfnt_off000148c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148C5 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3