Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c7704def8f10707…

MALICIOUS

PDF

76.0 KB Created: 2021-03-23 09:58:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 6bb57fb8279ab29e4dca486321a9e483 SHA-1: bd26d9468f766a39b64e00a43725778c560533b6 SHA-256: 3c7704def8f1070730814adcbeafd648c06a2fd271382d751836a09eacab3206
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is a PDF document flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with at least one pointing to a link farm on disposable hosting, suggesting an attempt to redirect users to malicious sites. No scripts were extracted, but the presence of multiple external URIs and the overall detection profile indicate a phishing or redirection attack.

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
  • 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://jottigo.ru/123?utm_term=flower+images+beautiful PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4488315/normal_5fe3e1ec5992b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408594/normal_603b6e7cbff56.pdfIn PDF document text
    • http://registrat.space/joxudobesikobuwite7pdb7.pdfIn PDF document text
    • http://lianhua.life/31619464124upd8.pdfIn PDF document text
    • http://natnat.fun/janugelumevriuq.pdfIn PDF document text
    • http://vashe-zdorovie.xyz/hitlers_table_talk_trke8e35q.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bokatamekal.rf.gd/fishing_guides_in_tillamook_oregon.pdfIn PDF document text
    • https://4461694d-a6f7-4a69-895a-ff5ddeb3c622.filesusr.com/ugd/f504fb_c028579582b241a2a03700a4e75a4f3f.pdf?index=trueIn PDF document text
    • https://438e95ed-c264-4db5-88d3-1a9ca8b91b86.filesusr.com/ugd/733c1f_89340e36b3d64f39b32443fd726360b4.pdf?index=trueIn PDF document text
    • https://c7972686-9310-4d97-8ac3-15e828887225.filesusr.com/ugd/8a419d_dc27ce99ee994247921691dcb7d24002.pdf?index=trueIn PDF document text
    • https://c6111751-42b6-464f-a8b1-832d492ff999.filesusr.com/ugd/3d0627_cf0888ef654549e0b501ecf77c7e30b7.pdf?index=trueIn PDF document text
    • https://d3826037-6016-486c-99e9-dc41bc666644.filesusr.com/ugd/b81754_c3f8bd31b6e34693a654239b0df29b73.pdf?index=trueIn PDF document text
    • http://xovijoj.epizy.com/phonics_coloring_worksheets_kindergarten.pdfIn PDF document text
    • https://s3.amazonaws.com/feliso/fukajoke.pdfIn PDF document text
    • https://d6aab468-caab-4d9e-910f-d3bf64ae4104.filesusr.com/ugd/5438e3_cf727c4e62424c508014bb10da9c478d.pdf?index=trueIn PDF document text
    • http://siletafelit.epizy.com/functions_of_infinitives_exercises_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/mefovu/abortion_law_reform_act_2008_victoria.pdfIn PDF document text
    • https://19aaccd0-9772-41b6-85c4-be118606641a.filesusr.com/ugd/a12125_3af14209fbb14673af16805c3cb7684a.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC85 5272 bytes
SHA-256: edb7c39b6b6426056542ef69bffa0415b1879fc72180f918b07d56961f990b91
font_01_sfnt_off0000fe73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE73 10992 bytes
SHA-256: 18177d9a6a4c177dc5ce8f615cfd48ca13ebd911973d381ed58401cc4638e25f

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