Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fcdb07353384d71…

MALICIOUS

PDF

74.8 KB Created: 2021-06-01 10:39:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 728d67e110a101f13ce0c257c55c001a SHA-1: 2b78ff84f6de66ea836ef771955859b1040a5abc SHA-256: 7fcdb07353384d7198cb08e6ed8e8b65b32e76a596cd5d13ad2781fedaee7642
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing trojan by ClamAV. It contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm or phishing campaign. The embedded document body, though heavily obfuscated, appears to contain search query-like text, further supporting a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://inwebjor.ru/pbw?utm_term=how+many+mg+of+docusate+sodium+should+i+take PDF link annotation
    • https://fekoguto.weebly.com/uploads/1/3/4/4/134491689/dalurawiniwiwof.pdfIn PDF document text
    • https://wejafivikime.weebly.com/uploads/1/3/0/9/130969279/zewora-rapimo-mobajademojenog.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494160/normal_6021a33aaead2.pdfIn PDF document text
    • https://girusetobar.weebly.com/uploads/1/3/1/0/131071114/zojexofin.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376354/normal_60063b7e687b1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478703/normal_5feb45ac2bf19.pdfIn PDF document text
    • https://fakegakimebel.weebly.com/uploads/1/3/7/5/137506517/844caf4ce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405953/normal_604b5b5d1ccc4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393751/normal_5fcf3c0926784.pdfIn PDF document text
    • https://zosupexaduj.weebly.com/uploads/1/3/0/7/130738593/737044.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8a9c420-95a5-4c0f-8bb3-2595fa05e645/lobuxinenuwike.pdfIn PDF document text
    • http://wuxikadafi.pbworks.com/w/file/fetch/144418296/84172745489.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9209b967-198c-4841-bdc0-a378ba285648/94557888638.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40d1e99e-0a1a-408d-8725-41d1aeeb78a5/analisis_sintactico_oraciones_subordinadas_ejercicios_resueltos.pdfIn PDF document text
    • http://nerobedevu.pbworks.com/f/alex_acheampong_song_ebebamu.pdfIn PDF document text
    • http://xedidovetaw.pbworks.com/f/wisupura.pdfIn PDF document text
    • http://nadupodifado.pbworks.com/w/file/fetch/144448509/the_lottery_by_shirley_jackson_multiple_choice_questions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2972423-9c33-498c-a3b4-0813298fd1d7/why_wont_the_black_ink_work_on_my_printer.pdfIn PDF document text
    • http://tusawijer.pbworks.com/w/file/fetch/144444183/luxabogevofubenese.pdfIn PDF document text
    • http://mifimoruzuwo.pbworks.com/f/fifty_shades_of_freed_movie_download_in_hindi_300mb.pdfIn PDF document text
    • http://wusagem.pbworks.com/f/23131343730.pdfIn PDF document text
    • http://kufujibumufa.pbworks.com/w/file/fetch/144412419/quality_function_deployment_and_six_sigma.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c339238-0468-4baa-9a5a-081e46dfc723/crash_mind_over_mutant_psp_romsmania.pdfIn PDF document text
    • http://sodopateduke.pbworks.com/w/file/fetch/144424791/ill_be_on_my_way_sheet_music.pdfIn PDF document text
    • http://xovelezid.pbworks.com/w/file/fetch/144415689/zekuzimuwariluzogalatejip.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_off0000e68b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE68B 5560 bytes
SHA-256: 9aa070538f0bfb1dc75429bf156b6ab2073e67bc5bdb13b228d600bd5dd39d89
font_01_sfnt_off0000f96c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF96C 10600 bytes
SHA-256: be4b75a44bef91d3d69b008538e8d892215102d6d78a759d52b62d8bb34a125c

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