Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a3491b2186573fb…

MALICIOUS

PDF

84.7 KB Created: 2021-03-24 18:01:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: f0980736ad3b1830c4495062962a5771 SHA-1: 69be6f9df4d0618bfb836fa33b08ae645277e0a0 SHA-256: 4a3491b2186573fb7c449720a9b597e10fc79a3582c11025a8b57442da019d16
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, with one specifically pointing to 'resalured.ru' which is flagged as a potential phishing or malware distribution site. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, further suggesting malicious intent. While no scripts were explicitly extracted, the presence of external URIs and the ML classifier's high confidence score point towards a malicious phishing or downloader campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=the+gold+gym+nutrition+bible+pdf PDF link annotation
    • http://fosavaxenu.mypressonline.com/jilosesu.pdfIn PDF document text
    • http://bafakuvim.sportsontheweb.net/54700388723.pdfIn PDF document text
    • https://cdn.sqhk.co/nojebimit/hhhh3Ph/adobe_after_effects_cc_free_templates.pdfIn PDF document text
    • http://max-lifting.store/nibaxegea40rt.pdfIn PDF document text
    • https://cdn.sqhk.co/kusonemap/jinjh4Q/frp_bypass_apk_for_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/duvetezoje/eEhhgiw/bucket_list_ideas_for_older_adults.pdfIn PDF document text
    • http://faxusigeroles.sportsontheweb.net/sum_function_in_excel.pdfIn PDF document text
    • http://lnstagramservicecopyrights.com/kutty_movies_2019_full_movie1s3tl.pdfIn PDF document text
    • http://bcpzon4segurabetaviabcp.com/dajedemoturiredojuxobazuiwuu.pdfIn PDF document text
    • https://cdn.sqhk.co/posukomokufi/82RHhaq/2017_iihf_world_junior_championship_rosters.pdfIn PDF document text
    • http://wumewil.sportsontheweb.net/vitarakono.pdfIn PDF document text
    • http://joriwolujuf.sportsontheweb.net/muxaxa.pdfIn PDF document text
    • https://cdn.sqhk.co/difakezil/djdkjd5/37738928721.pdfIn PDF document text
    • http://shoop-ft.ru/picsart_pro_mod_cracked_apkjsvdi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/797433b8-1482-44c1-9fb7-46697078c056/gisexogizebanipawovizaj.pdfIn PDF document text
    • https://s3.amazonaws.com/bokofapig/what_is_hedonistic_theory.pdfIn PDF document text
    • http://pofijiserige.onlinewebshop.net/99291458373.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a5f17c7-33b0-4b29-a588-aad11ca83dd6/ridanesebup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52057f7c-e867-46f6-9352-89b22187a304/92095606383.pdfIn PDF document text
    • https://s3.amazonaws.com/zakunafu/wotobonutowezi.pdfIn PDF document text
    • http://seretavezoduriz.onlinewebshop.net/patterns_of_enterprise_application_architecture_free.pdfIn PDF document text
    • https://s3.amazonaws.com/xunilukegez/grok_learning_answers_html.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08648550-6ffc-43f7-a96d-d0f83b7edda5/zetetoxotudifarutotev.pdfIn PDF document text
    • https://s3.amazonaws.com/pafexegud/87057363860.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010eba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EBA 5260 bytes
SHA-256: b32b83272365eb3927c7c5ba9c00af1390799819f215f422b4cca293599256ed
font_01_sfnt_off0001207a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1207A 11032 bytes
SHA-256: e87aa691ae61fbc6457bc4324f0bcb3005052ede2ff30561f8bc974a6b0b3710