Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2085fc327bde54f…

MALICIOUS

PDF

77.9 KB Created: 2021-03-09 11:07:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 4f1bf2f39b9b7bca35daa520874734ff SHA-1: e33eec68ffa98e127c19e79a22ed3cccce8827a5 SHA-256: e2085fc327bde54f2fb43328773c5c863ece610a70c40e846f8757b533838a5f
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by multiple heuristics as malicious, including ML classification and ClamAV detection. It contains numerous embedded URLs, many of which point to disposable hosting and are likely used to redirect users to phishing or malware download sites. The presence of external URIs and link farm characteristics suggests an attempt to distribute malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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://leonvi.ru/123?utm_term=ap+literature+exam+2018+pdf PDF link annotation
    • http://otomail.business/udp_glotorrents._pw_6969_announlybj8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370076/normal_600f465e173b5.pdfIn PDF document text
    • http://espaceabone.com/vofobujikibumolaj1doh.pdfIn PDF document text
    • http://5gusevshop.space/business_dictionary_definition_of_contract_of_employmenthddbt.pdfIn PDF document text
    • http://tesocoin.online/wusaxupuzimukediz3qstq.pdfIn PDF document text
    • http://leopards.space/metric_pattern_cutting_for_menswearxlr6v.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427287/normal_60078c480817b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365541/normal_5ff25c8d16c45.pdfIn PDF document text
    • http://fragcups.com/rozikoxumnjxdp.pdfIn PDF document text
    • http://genusttwsr.fun/upsc_answer_sheet_formattiym9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382621/normal_6041b3301e2e3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4503787/normal_6003382de4a77.pdfIn PDF document text
    • https://cdn.sqhk.co/kunimanujage/4Qhjhal/amazon_seller_app_bluetooth_scanner.pdfIn PDF document text
    • http://redit.fun/dell_3100cn_service_manualxz4xr.pdfIn PDF document text
    • http://bitjoms.xyz/fafemujkvbqb.pdfIn PDF document text
    • http://cleaner360.shop/ginger_farming_guidexylp2.pdfIn PDF document text
    • https://cdn.sqhk.co/zoluwumenad/j5Giijg/sekidunafesi.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/4003438f-62aa-45a7-8aa3-c2816bda6a69/oral_b_pro_1000_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9804223-56be-4f76-aa8a-90697ab6ac2e/2990543398.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20a7823e-ee59-4ad9-8de2-716be9a1fac0/41952041705.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1396adf3-1319-42f2-8f5e-6ffeea0d8905/cost_of_thermo_king_apu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba7edb29-8d5b-4e64-8dfa-80eef85cd18e/44347809878.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_off0000f3e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E6 5588 bytes
SHA-256: 1a47cd77b581d6c4cb65fdda5075398202bc86a50aa4caa2c1a1c75a5a631000
font_01_sfnt_off000106d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D8 10504 bytes
SHA-256: b1d07d1c2a7150541917ac0b0d870391a6f7f7d43a46dfd380b464b7446df7ef

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