Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7c5c6067cb7234f…

MALICIOUS

PDF

89.3 KB Created: 2021-03-18 21:35:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 6eb936fa90a7f4e8cebaf4468458b2bd SHA-1: 57adb663f8d775b90e94267b44b9931633c50534 SHA-256: b7c5c6067cb7234f584e766c6852e56d264562cd0848d674785cb12f6dbe4355
196 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious content. It contains numerous external links, suggesting a link farm or phishing attempt, with one prominent URL being https://resalured.ru/award?keyword=calendario+2020+semanas+pdf. The presence of 'cmd.pdf' and related URLs in the document text, along with the PDF_SEO_LINK_FARM heuristic firing, points towards an attempt to manipulate search engine results or direct users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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.
  • 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.
  • 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/award?keyword=calendario+2020+semanas+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4403818/normal_600b40c5d072b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408871/normal_5ff1e87e04e75.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371003/normal_5fdb2365c6c03.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448740/normal_60136c5386267.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://b70645e9-42d7-44c6-80f2-f165c8819e8d.filesusr.com/ugd/3f1130_404dbb6166204ecea2a0d929bdcf92e2.pdf?index=trueIn PDF document text
    • http://kiwusegofavuto.rf.gd/stranded_3_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98289748-cd59-4411-828a-c5a2d2145296/91760628820.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9981d3c-e437-490f-8a72-4505c3a9ff7b/how_to_check_printer_serial_number_through_cmd.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e10dd39d-4ddf-4a8a-a133-4877173f4ea5/how_do_i_fix_the_red_light_on_my_att_router.pdfIn PDF document text
    • https://s3.amazonaws.com/bibejovixapis/vunobifomoderudixagofiw.pdfIn macro / runtime command snippet
    • https://s3.amazonaws.com/wovisak/fondant_rose_cutter_template.pdfIn PDF document text
    • https://s3.amazonaws.com/nigimul/62325215644.pdfIn PDF document text
    • https://s3.amazonaws.com/fadobirak/fazipatuxozofanobiruwejus.pdfIn PDF document text
    • https://85fc0914-20e3-4f1c-be8c-de7e6f89f47e.filesusr.com/ugd/a44510_410418a42bc8432186d210d5ac4e46b8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zijivevip/98836629706.pdfIn PDF document text
    • https://1794ee33-230d-455b-98b1-84d48067edce.filesusr.com/ugd/551769_0346d12c7c7f422f9663042e80bf5777.pdf?index=trueIn PDF document text
    • http://soxidavalib.rf.gd/39182811813.pdfIn PDF document text
    • http://vefagukolile.epizy.com/spider_man_3_ppsspp_game_free.pdfIn PDF document text
    • https://s3.amazonaws.com/gozilum/how_to_remove_stuck_water_filter_from_frigidaire_refrigerator.pdfIn PDF document text
    • https://s3.amazonaws.com/busutafitufe/simple_agreement_of_sale_template.pdfIn PDF document text
    • https://s3.amazonaws.com/suxuzubojut/primary_biliary_cholangitis_easl_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/tutapaxi/cyanogenmod_4._2_2_cm_10._1.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.com/files/e10dd39d-4ddIn macro / runtime command snippet
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B8 5192 bytes
SHA-256: 5d21d84f302739aca4004c8dc9d0b0963158ef21aa1d7db809e089009b92b1a1
font_01_sfnt_off00010a3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A3A 13060 bytes
SHA-256: 9c264d53f96da2731a95c5a707a9e08a2b179983cc68696db618e3791de6f98f
font_02_sfnt_off000132a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132A9 16224 bytes
SHA-256: c4441e48b2f68604838bd51e3092d1355fc6ad73caca962ec91191dcf11ac5c9
font_03_sfnt_off000147d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147D0 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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