Malicious PDF — malware analysis report

Static analysis result for SHA-256 edf18cd93a4eac7d…

MALICIOUS

PDF

66.1 KB Created: 2021-03-03 08:32:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 6f49bed6e960ef055f540a15e249b368 SHA-1: d40eb53c5e1b5b880c50ac3db96b2f88e7d5b643 SHA-256: edf18cd93a4eac7de8b48de1b85eb2771f600724a56701ced2c95f67cec5c319
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, appears to be a lure related to academic content, suggesting a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=compare+and+contrast+the+structure+and+function+of+arteries+and+veins+quizlet In PDF document text
    • http://pasendapp.online/24567332917i6lgy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408879/normal_6016acca03425.pdfIn PDF document text
    • http://juwoniki.getenjoyment.net/chapter_12_ap_chemistry_test.pdfIn PDF document text
    • http://tidirakozodawon.getenjoyment.net/d-link_dsl-2750u_software_update_download.pdfIn PDF document text
    • https://xifekuvazunavel.weebly.com/uploads/1/3/4/7/134748582/1381884.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393346/normal_5fca93b66866b.pdfIn PDF document text
    • https://luwujapi.weebly.com/uploads/1/3/4/7/134751522/tekeb_munusakusem.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413111/normal_5fe38d6ad88a5.pdfIn PDF document text
    • https://wefigofotagovir.weebly.com/uploads/1/3/4/8/134864379/josidusuke.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/sefiwegegagu/jamokasetuvomonopameke.pdfIn PDF document text
    • https://s3.amazonaws.com/lonozote/how_to_get_rid_of_belly_fat_meal_plan.pdfIn PDF document text
    • http://lajoxugulip.epizy.com/how_to_use_dayton_battery_charger.pdfIn PDF document text
    • https://s3.amazonaws.com/lomogas/gozojegoburixunavuwa.pdfIn PDF document text
    • http://vovojoj.atwebpages.com/dell_inspiron_17_5000_series_ram_upgrade.pdfIn PDF document text
    • http://dajajubofu.rf.gd/bevijigipusololegerures.pdfIn PDF document text
    • http://waxobutadarase.rf.gd/tomb_raider_definitive_edition_guide.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_off0000c743.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC743 5536 bytes
SHA-256: 262426ad14738caedc4062d384399b58a27ef6d5be56c28318f0b9b171cdfb50
font_01_sfnt_off0000d9f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F4 9460 bytes
SHA-256: b7d5e4b7d9275f0ab3e305371a1908087f3472b0411582054f8af4fd65f02afc

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