Malicious PDF — malware analysis report

Static analysis result for SHA-256 d185a893b6044514…

MALICIOUS

PDF

76.3 KB Created: 2021-02-28 03:50:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: ba28d31e4290294bef02ce4f78744e96 SHA-1: 503b87c8a34ad4ed05c9be019e3b79d3c039ac3f SHA-256: d185a893b6044514b86f14f9846233fdeb250ed0789d4167f9e87ee039bbb7de
156 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 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://dafemum.ru/strik?utm_term=storm+king%2527s+thunder+miniatures+brick PDF link annotation
    • http://powajaxib.medianewsonline.com/epson_v370_perfection_flatbed_scanner_argos.pdfIn PDF document text
    • http://momarivido.mypressonline.com/56812107512.pdfIn PDF document text
    • https://rifejosowutero.weebly.com/uploads/1/3/4/6/134691359/6138650.pdfIn PDF document text
    • https://cdn.sqhk.co/pixafosabow/hiwtjfX/podium_racing_wheel_f1_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/rubovadu/08gebuR/32642705698.pdfIn PDF document text
    • http://wojisub.mypressonline.com/26264420451.pdfIn PDF document text
    • http://pimifawimonidij.mywebcommunity.org/how_spell_slots_work_5e.pdfIn PDF document text
    • https://varowuzogan.weebly.com/uploads/1/3/1/8/131856285/rivesesikeroveri.pdfIn PDF document text
    • https://nilowebun.weebly.com/uploads/1/3/4/7/134751503/8142ace496847eb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tuxalowafokuvo/15_chemical_kinetics_rate_laws_worksheet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/tigewibejageju/wadumomagufajolopizewawa.pdfIn PDF document text
    • https://s3.amazonaws.com/dubiditiginowo/dotuval.pdfIn PDF document text
    • https://s3.amazonaws.com/xiwevitox/how_to_hard_reset_an_alcatel_one_touch_evolve_2.pdfIn PDF document text
    • https://s3.amazonaws.com/doxifuba/latin_american_city_model_ap_human_geography.pdfIn PDF document text
    • https://s3.amazonaws.com/dewutexorob/41715400003.pdfIn PDF document text
    • https://s3.amazonaws.com/nezanurugega/first_degree_heart_block_treatment_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/zubuwujoxom/zapabonisadu.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
    • 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_off0000c814.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC814 5660 bytes
SHA-256: f82551a6a0f713455f8a3a6ec352fb1af6f09b1db3803def6abd79c3bccb9e3c
font_01_sfnt_off0000db2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB2B 2048 bytes
SHA-256: 2f430097b0e4e500d7174239800a4340685bc181b3707dff1089dac455c017f5
font_02_sfnt_off0000e40b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE40B 12124 bytes
SHA-256: 3835b7573124b422def0cef671ca7978ba86b6698f1d4a167af31c608c178464
font_03_sfnt_off00010cf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF4 16064 bytes
SHA-256: 6f17b99764d671a96c0d2fd0b5f339513c2ddbf7efa5d755f63b897ad21dd613

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