Malicious PDF — malware analysis report

Static analysis result for SHA-256 a04568307b8b2793…

MALICIOUS

PDF

86.7 KB Created: 2021-05-04 11:08:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 76b6e68dcd6c383b7b24cec6d7e0197d SHA-1: 532035dfc25ddb616d7ff597a846816bbc8fa0ea SHA-256: a04568307b8b2793d503a007180920aeff883132e453434de2c687b264b23ae3
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 0.9995

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://resalured.ru/strik?utm_term=does+artyom+die+in+metro+last+light PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4489988/normal_5fe81e3fa1035.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446019/normal_604d7edb2df91.pdfIn PDF document text
    • https://zovarufegurer.weebly.com/uploads/1/3/4/6/134625168/bozoridijibejazig.pdfIn PDF document text
    • https://kogevinipuban.weebly.com/uploads/1/3/4/5/134514077/7205567.pdfIn PDF document text
    • http://re-capital.ru/61222525812wkx9f.pdfIn PDF document text
    • http://fagixadako.iblogger.org/how_much_do_computer_engineers_earn_in_australia.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454808/normal_601ffc5806175.pdfIn PDF document text
    • http://allfreebets.ru/analyzing_likert_scale_data_in_spssm92rp.pdfIn PDF document text
    • https://dukalafaziwemum.weebly.com/uploads/1/3/4/7/134772398/pireneladetupozafu.pdfIn PDF document text
    • http://sentytld.online/31572767756qylt7.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
    • https://da5bec28-7969-4117-8ffb-5069fce5e80c.filesusr.com/ugd/31593d_d2200d43b4c04f57ab759ca89fef7939.pdf?index=trueIn PDF document text
    • https://f8d82b49-d438-4da2-b906-f876cb6fe635.filesusr.com/ugd/12dc78_a345083d00d342d7ad1ae435d8aad34e.pdf?index=trueIn PDF document text
    • https://d5fd0048-bb8d-45a1-ba21-28d1cb0b7162.filesusr.com/ugd/5e8de6_10c14c1f211d4976a2da61a174f98441.pdf?index=trueIn PDF document text
    • https://506dbbd1-d4b3-44b1-a4c9-6b5d0cab6a23.filesusr.com/ugd/c75f60_483a76acbd404e4fa23bd08bc33544f5.pdf?index=trueIn PDF document text
    • http://wuralelafefikox.epizy.com/modulo_ritenuta_d_acconto.pdfIn PDF document text
    • http://zigexejumex.epizy.com/86228730518.pdfIn PDF document text
    • https://58eafb2e-ea74-4523-a1b2-d2e0fe9bfe54.filesusr.com/ugd/466fa0_27403d8e7905489e9d71a93d0d97401e.pdf?index=trueIn PDF document text
    • http://dazofakokiwis.epizy.com/weber_spirit_ii_e-310_natural_gas_review.pdfIn PDF document text
    • https://be1b941d-c88c-475c-9260-a39c9d088d9d.filesusr.com/ugd/5c562d_4e311114502b48aab0ada92072b5f548.pdf?index=trueIn PDF document text
    • https://c6111751-42b6-464f-a8b1-832d492ff999.filesusr.com/ugd/3d0627_76d949e1d748408daa2197294adf724f.pdf?index=trueIn PDF document text
    • https://c1e70603-6ca1-47bc-880b-b60d7d434995.filesusr.com/ugd/df625d_c6936ff89653454ab41904f613f7b574.pdf?index=trueIn PDF document text
    • https://f3dbd103-cf2f-44fc-b0ad-c9004dc38af2.filesusr.com/ugd/1f2646_e9c46de376c9475a8a2d09eaa0eb4bb2.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001072f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1072F 5128 bytes
SHA-256: a58a7c32790b8f9907866f04cd794b3a62a953d2777636c91d20b8734ca6dbf9
font_01_sfnt_off00011873.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11873 10948 bytes
SHA-256: 612baa74d463ac6df03112e531e1f6c20cc28892752eb65e93dd8b64808d5b24
font_02_sfnt_off00013da3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DA3 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f