Malicious PDF — malware analysis report

Static analysis result for SHA-256 657295fa5d13cb0c…

MALICIOUS

PDF

73.5 KB Created: 2021-03-16 07:11:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 6cfd70f39515fe32febd209518f19385 SHA-1: 5facbddc7a2ef80c929e619e7b79d16f4dae8bd5 SHA-256: 657295fa5d13cb0cd169cca5897a3ebb9104d880335503c54958211d925dcba5
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one prominent URL leading to a site that appears to be a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the PDF is part of a scheme to generate traffic or distribute malware through disposable hosting. No scripts were extracted, but the presence of numerous external links points to a phishing or malware delivery 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
  • 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://xajibur.ru/aws?utm_term=simple+and+compound+sentences+quiz+with+answers PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4490547/normal_5fce7c44615a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453098/normal_5fe8690826ba9.pdfIn PDF document text
    • https://cdn.sqhk.co/videgogaf/jbogegj/school_management_system_software_demo.pdfIn PDF document text
    • https://cdn.sqhk.co/samekikogeri/hcD64ii/24359264855.pdfIn PDF document text
    • http://jiwimejikigigu.mywebcommunity.org/kemelivibexokixovekotegad.pdfIn PDF document text
    • https://cdn.sqhk.co/kosibowo/cAicPig/chopin_nocturne_op_21_sheet_music.pdfIn PDF document text
    • https://sekitajed.weebly.com/uploads/1/3/1/3/131383533/lezadufoxal.pdfIn PDF document text
    • http://garowige.iblogger.org/african_culture_and_civilization_a_textbook_for_ges_102.pdfIn PDF document text
    • https://zutijuxugovoxi.weebly.com/uploads/1/3/4/6/134684331/f7ae51.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453902/normal_5feccb2437d0d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://xifabopopotesa.epizy.com/janapada_songs_please.pdfIn PDF document text
    • http://purupuladufuba.rf.gd/69946648074.pdfIn PDF document text
    • http://fopajika.epizy.com/goat_simulator_goatz_trophy_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2fea5765-2e54-4039-b668-e6238cda0888/mozilla_firefox_43.0_download_64_bit.pdfIn PDF document text
    • http://jemileti.atwebpages.com/kukavejolofu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c9e0bc0-5282-469e-99a4-c288b8bb96c5/56803058324.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a38aaf2-eff8-49c4-898e-4ae08ab5eb0a/38924873843.pdfIn PDF document text
    • http://wufizomofoduzin.rf.gd/disney_cello_sheet_music_free.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d47f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD47F 5564 bytes
SHA-256: a73c26f0d9fa7332288a692bc80132a5cf03022703b1a657f48a4063508e9cf1
font_01_sfnt_off0000e740.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE740 10244 bytes
SHA-256: 084620dd1b40f7b7051815c122fd936eb1c2f906168dd43e94f04d2eb0fbcfa1
font_02_sfnt_off00010a23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A23 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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