Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9b15e05936970c9…

MALICIOUS

PDF

132.0 KB Created: 2021-01-11 21:40:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: d91eeb4b3e0d3093d81fd86652bda05b SHA-1: edf2c67b298f6480ac3123790e9700a724d507fb SHA-256: b9b15e05936970c9c14dc48dcfa64ee5b8ceaa02703c5e7fdab500f538fe8076
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, specifically flagging it as a phishing trojan. It contains numerous embedded links, with at least one pointing to a known malicious redirector. The document body is heavily obfuscated and appears to be junk data, suggesting the primary purpose is to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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
  • 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://traffmen.ru/123?utm_term=myth+name+generator In PDF document text
    • https://site-1178950.mozfiles.com/files/1178950/scalextric_digital_arc_pro_review.pdfIn PDF document text
    • https://site-1178950.mozfiles.com/files/1178950/best_recharge_offers_for_idea.pdfIn PDF document text
    • https://wogijelagorezu.weebly.com/uploads/1/3/4/0/134096035/6114849.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467927/normal_5fdfb7a6bce40.pdfIn PDF document text
    • https://site-1172079.mozfiles.com/files/1172079/40726603754.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411491/normal_5ff42fce01f39.pdfIn PDF document text
    • https://site-1168429.mozfiles.com/files/1168429/kuvuxidejenoda.pdfIn PDF document text
    • https://site-1174749.mozfiles.com/files/1174749/49949489426.pdfIn PDF document text
    • https://site-1177041.mozfiles.com/files/1177041/wifi_analyzer_apple.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366000/normal_5f8fc56f1c3a3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367959/normal_5f927feeb6167.pdfIn PDF document text
    • https://govasosu.weebly.com/uploads/1/3/4/5/134519533/b5e8e2dc5358be2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461773/normal_5fdb586856d59.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.thdl.org/http://www.thdl.org/TibetanIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/fasanag/62522794603.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://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlTibetanIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text

Extracted artifacts 7

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016704.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16704 4736 bytes
SHA-256: 344a663035d4d7b69131575cdfa2d642bb871d6f8f868ffe8a7e504330337adc
font_01_sfnt_off000176ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x176EC 9964 bytes
SHA-256: abf1d65e20d2d61f324d9b802298e89f7b2c029e4294eec4b2d5b0b7e1ef2575
font_02_sfnt_off00018ba8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18BA8 1800 bytes
SHA-256: e9a5a1f6ed95b1e3669933bb00002ad32a1708c3e0b735191cad5e02368a6c7d
font_03_sfnt_off00019436.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19436 15436 bytes
SHA-256: 55e884a0d04157b010994356e71d9c66ad6c947f1fd6f986a95d148d94c2fa1f
font_04_sfnt_off0001c613.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C613 18016 bytes
SHA-256: 13d96fceaba63fce7642dca1a62dce576bb65d9966f5a752ab3e2734fd5d5d76
font_05_sfnt_off0001e209.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E209 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3
font_06_sfnt_off0001efcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EFCC 6204 bytes
SHA-256: a24a704a7b707353e33d8490e53b918221e6194db87cf4ebfc228757db360471

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