Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b0e0fb6cc4c55ae…

MALICIOUS

PDF

78.2 KB Created: 2021-03-24 16:41:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: cadd2c5f67e9ef81c780a3c4b7ec8d8c SHA-1: d82819b7fa29bdbfac2ee54bf5e67ac8c97697c5 SHA-256: 1b0e0fb6cc4c55ae64ff08bd1f12069b4f5253a0fb7760eafdcd1c8a56e4ad2e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs, including a link farm on disposable hosting, suggesting an attempt to redirect users to malicious sites. The document body, though heavily obfuscated, contains keywords related to product issues ('Toshiba 32c120u issues') and the authoring application, which are likely lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • 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://nipisod.ru/strik?utm_term=toshiba+32c120u+issues PDF link annotation
    • http://xaredazisom.mywebcommunity.org/labebikusolodajajejomelen.pdfIn PDF document text
    • https://renudufodajofi.weebly.com/uploads/1/3/4/8/134884992/7247192.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368244/normal_600070a71d4cc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464301/normal_6002977de8a0a.pdfIn PDF document text
    • http://puliliraforuwu.22web.org/fatal_frame_ps2_guide.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409798/normal_5fc7ebdd09bca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403129/normal_6018a3504eecf.pdfIn PDF document text
    • http://gixipures.sportsontheweb.net/55299280117.pdfIn PDF document text
    • https://jokinurelebuvet.weebly.com/uploads/1/3/1/8/131856462/a4e377795e80b1.pdfIn PDF document text
    • http://pikejofopon.mypressonline.com/ccna_1_lab_manual.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/nezanurugega/drawing_simple_electrical_circuits_worksheet.pdfIn PDF document text
    • https://7a3463bf-3117-47cc-940f-ad9d50d05675.filesusr.com/ugd/9f2514_a1514e8ce4464e94b7cd22e5254d6336.pdf?index=trueIn PDF document text
    • https://aefbb2f1-1cfc-4a48-aab2-d72547d84173.filesusr.com/ugd/2f3ac6_6b44c79cb0d84f4abbfc021f77bd2657.pdf?index=trueIn PDF document text
    • http://lufafutogixafu.rf.gd/rejajujuvaxa.pdfIn PDF document text
    • http://soranodabiwegi.myartsonline.com/88924764627.pdfIn PDF document text
    • http://fupuzujovo.epizy.com/css_reset_stylesheet_2019.pdfIn PDF document text
    • http://wuzegez.epizy.com/64824897361.pdfIn PDF document text
    • https://22520ec4-2132-45a5-98b8-54db1b71d3ea.filesusr.com/ugd/b33b96_b8c8f88debb249f7a3067eb2047f49e2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lopeteb/how_to_learn_english_grammar_easily_in_hindi.pdfIn PDF document text
    • https://s3.amazonaws.com/bulozor/chammak_challo_song_masstamilan.pdfIn PDF document text
    • https://73f4d879-981c-49fe-abc7-520f36a14a84.filesusr.com/ugd/b77b08_39d0cdc00b7c497a849d255582f93ece.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fewunadupop/66550767667.pdfIn PDF document text
    • http://repajazofuwide.epizy.com/larebawa.pdfIn PDF document text
    • https://s3.amazonaws.com/sifawekujiki/the_power_of_positive_thinking_in_telugu.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_off0000f28e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF28E 5336 bytes
SHA-256: 58e7dd28ba617bc16635b5583f1c68396ad3d9cbc36b6bc27f0aae52567fa7cf
font_01_sfnt_off000104b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B6 11424 bytes
SHA-256: 29cbd382470f07b3df553b2a39224e0b06e19cead17e9fb9c70328e9945e0ebe

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