Malicious PDF — malware analysis report

Static analysis result for SHA-256 df882b31f9a4d810…

MALICIOUS

PDF

79.8 KB Created: 2021-03-17 07:01:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: a36df86c475595be7dd463e7c0578c18 SHA-1: b096302554e3e133f930727771deea70f676c5ef SHA-256: df882b31f9a4d810737fbebc8bb0308233fa406cde3e4f3a2277760ba08e4346
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9998

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 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://jacksth.ru/wix?keyword=black+and+decker+lithium+halogen+spotlight+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4414515/normal_5fe74fc81eade.pdfIn PDF document text
    • http://fujepopini.22web.org/facial_recognition_system_seminar_report.pdfIn PDF document text
    • http://binekolojej.iblogger.org/bounce_free_and_gentle_dryer_sheets_sds.pdfIn PDF document text
    • http://bajoreto.sportsontheweb.net/foods_that_boost_metabolism.pdfIn PDF document text
    • http://buvozadiveniz.22web.org/case_study_house_9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477626/normal_5fcce3021df16.pdfIn PDF document text
    • http://ranupila.mywebcommunity.org/brazen_and_the_beast_download.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/nafibanefexex/pumudijerupajuxeta.pdfIn PDF document text
    • https://s3.amazonaws.com/wifiduxezo/is_padi_open_water_difficult.pdfIn PDF document text
    • http://fekalalorupip.rf.gd/how_to_replace_battery_for_jeep_grand_cherokee_key_fob.pdfIn PDF document text
    • http://mafonevaverazux.atwebpages.com/convert_a_jpg.pdfIn PDF document text
    • http://vipujaxetixise.epizy.com/90971646624.pdfIn PDF document text
    • http://jerananixakuzeb.epizy.com/wotov.pdfIn PDF document text
    • http://samepuwewar.rf.gd/basic_electronics_notes_by_arun_kumar.pdfIn PDF document text
    • http://gixarewujedel.atwebpages.com/harrisons_manual_of_internal_medicine.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwuzerijofa/psychological_assessment_resources_coupon_code.pdfIn PDF document text
    • https://s3.amazonaws.com/vapelurowar/2891736316.pdfIn PDF document text
    • https://eb40363d-1d1f-4170-a897-f23f0f433116.filesusr.com/ugd/2a1429_2595985ddcff42b2aabfad26bed19713.pdf?index=trueIn PDF document text
    • http://levajutesa.rf.gd/assembler_compiler_interpreter.pdfIn PDF document text
    • https://62abf401-5fc9-4991-ac00-cb6a0c8cf8ec.filesusr.com/ugd/e4ff69_7b6702f7f578497bb7274036a6b78e8e.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f803.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF803 5600 bytes
SHA-256: 051236fc0536817d88a75c372b1337940f586a8777124009bf5413327beac449
font_01_sfnt_off00010ae4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE4 11500 bytes
SHA-256: 88152f4e236e73593fabf3e6e7a0590c57fc22c8477b4603ee8e088340cad533

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