Malicious PDF — malware analysis report

Static analysis result for SHA-256 436a144064005ea8…

MALICIOUS

PDF

77.4 KB Created: 2021-05-24 12:12:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 2cd425b8f60a4b296eeb81f97b4cb055 SHA-1: 70ac1aabfaed305fc0c8d0376025de851d0a9de0 SHA-256: 436a144064005ea886cb68cc913de88ad99e8d9f1fc3c5353793aca4a201a7c1
186 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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://soxebez.ru/strik?utm_term=ejemplo+de+planeacion+por+proyectos+en+educacion+primaria PDF link annotation
    • https://lobovalosidim.weebly.com/uploads/1/3/1/4/131437181/87844f95.pdfIn PDF document text
    • https://faxojoduso.weebly.com/uploads/1/3/5/3/135351685/a7f3cf2b507f.pdfIn PDF document text
    • https://basoxafal.weebly.com/uploads/1/3/4/4/134499196/f70c45f.pdfIn PDF document text
    • https://vedixoba.weebly.com/uploads/1/3/4/8/134864822/ronofukixupu_kekud_wufudoza.pdfIn PDF document text
    • https://bibutijelogoper.weebly.com/uploads/1/3/2/7/132740620/ca2d8617d.pdfIn PDF document text
    • https://mogatuzutixu.weebly.com/uploads/1/3/4/6/134684840/tikowib-tuges-xanomuzogifowat-pakororaludupu.pdfIn PDF document text
    • https://xowunaxevome.weebly.com/uploads/1/3/4/6/134679103/koxokepanir_tuteradovej_patiro.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/27194f25-ecd8-4829-89ce-e703bbbf8d24/how_to_do_scientific_research_in_high_school.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e49ddc13-eb53-43e6-96e3-7977b06adb5f/ipv_mini_2_box_mod_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a1f16af-d411-4908-9a85-6b76ffd08ccb/fexokubosezusobiwavonofu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f14939ed-81e8-417b-810d-d5be24c4a37b/dnealian_cursive_handwriting_practice_sheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b71e8d3c-e94f-4139-a512-ce11f132a1d1/where_to_buy_intimate_apparel.pdfIn PDF document text
    • https://s3.amazonaws.com/litunux/faster_than_light_ships_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/zikeko/55070806325.pdfIn PDF document text
    • https://s3.amazonaws.com/rojalexipokadaz/mifikowilitabefejixewoli.pdfIn PDF document text
    • https://s3.amazonaws.com/rewepalazamiso/oracle_pl_sql_datetime_comparison.pdfIn PDF document text
    • https://s3.amazonaws.com/wolina/coding_guidelines_for_inpatient_rehabilitation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5138fb2a-568a-4e58-9ca7-29d6bc5e98eb/99845303195.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9b95598-613f-4f74-bc6c-f3fdcca344e5/3295811904.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e9edb70-2286-4862-94ad-d58c1a75d340/72719954338.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_off0000ee3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3F 5356 bytes
SHA-256: 9fe0ba2a0c587760bff4626ad4e6614c9465dee717b2e362dd7e0de15e34c96f
font_01_sfnt_off00010065.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10065 11604 bytes
SHA-256: 7ab080ee1b7bf15d71176de947a2fcf1446e91392016ecad94a22ab32077c324