Malicious PDF — malware analysis report

Static analysis result for SHA-256 818b14aa9cc06900…

MALICIOUS

PDF

78.0 KB Created: 2021-04-17 17:29:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 84e1a71edc50e70812e0af927f37fe56 SHA-1: d0ad2f4df29bf3272476b921ffa2623cbae50113 SHA-256: 818b14aa9cc0690064e8c88a2e5e70364e3f8e414a398cd48b5061d368b8eff8
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The file is a PDF that contains numerous external URIs, with one specifically identified as a malicious link farm. ML classifiers and ClamAV detections strongly indicate malicious intent, classifying it as a phishing or trojan. The presence of 'curl_watch_accessories.pdf' and a URL pointing to 'lozipotod.ru' suggests an attempt to download or redirect to malicious content, likely exploiting a PDF vulnerability.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://lozipotod.ru/strik?utm_term=does+swae+lee+have+a+kid PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4393889/normal_5ffe6f55a4c86.pdfIn PDF document text
    • https://cdn.sqhk.co/legikowe/BhfkXZN/69021716416.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418362/normal_604d1b24663cc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490746/normal_5fef7deedfc14.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478951/normal_5ff2b9a02cb2a.pdfIn PDF document text
    • https://cdn.sqhk.co/tiwoxebu/jahcwjf/chicken_gumbo_recipe.pdfIn PDF document text
    • http://allroadkamchatka.ru/31949031240n3uw2.pdfIn PDF document text
    • http://najisemure.medianewsonline.com/jigaxosafatunanur.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426261/normal_5fca816f78447.pdfIn PDF document text
    • http://ig-about.net/19255729120kntp8.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/ef603dec-1772-4f7a-b381-b6842a445f56/acido_clorhidrico_numero_atomico.pdfIn PDF document text
    • https://ef5e9b3f-1a8e-4c79-9b60-34b8f8133c96.filesusr.com/ugd/18574e_874cae34450445d1be08bf2f87f930a1.pdf?index=trueIn PDF document text
    • http://xotopusedewix.myartsonline.com/bimudowijodakemewejojok.pdfIn PDF document text
    • https://2e5cbe44-7de3-4e3f-b94c-8a8567814465.filesusr.com/ugd/f96b02_0328f1eeac0845c29d2e81bbe7b7f4be.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/038697d1-9011-4675-b9b9-87893ffc9fab/rip_curl_watch_accessories.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1121ab7-8a1b-41d4-a62e-0bb63f12d43c/international_financial_management_jeff_madura_test_bank.pdfIn PDF document text
    • https://9f61dd91-ea7e-4edc-a837-c43fae5dccfb.filesusr.com/ugd/ed897c_e779b559fede42ba8fa0bd1d05c27248.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/828455e7-86ff-4204-8937-b030872aec2a/50511764288.pdfIn PDF document text
    • http://benamow.myartsonline.com/beauty_and_the_beast_piano_chords.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
    • https://uploads.strikinglycdn.comIn macro / runtime command snippet
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f04b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF04B 5032 bytes
SHA-256: d8c5870d75b56f8e454cd07053b851f542cb9c2939638eb0181f51d44f6f4156
font_01_sfnt_off00010181.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10181 12216 bytes
SHA-256: 0c293dcaea8eb4eeb18ec621900cff0e6572a5cfbd9dcb06dcc25be5be47e3ef