Malicious PDF — malware analysis report

Static analysis result for SHA-256 0948a3063d7d6281…

MALICIOUS

PDF

178.6 KB Created: 2021-03-02 05:45:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 71aae2870b9ca4cf14e2e53e8abcf7ef SHA-1: 76f773c4cb781c1d6d4e272bc13da74786ccefe7 SHA-256: 0948a3063d7d628134f7c6813ebb1dc6d02fa874fbbf4cb9c4370582ead8162c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to disposable domains, characteristic of a link farm or SEO poisoning scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, suggesting the PDF's primary purpose is to redirect users to a network of sites, potentially for phishing or further malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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=franz+kafka+biography+short PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4480581/normal_6018652e39ea6.pdfIn PDF document text
    • http://bigmagazin.xyz/6828889487t9utr.pdfIn PDF document text
    • http://sevowina.medianewsonline.com/80376611076.pdfIn PDF document text
    • http://sezejawi.mypressonline.com/tamil_christian_prayer_book.pdfIn PDF document text
    • http://canlisohbetim.net/tulja_bhavani_marathi_video_songs_free09gvo.pdfIn PDF document text
    • http://betijeduw.getenjoyment.net/how_to_put_nyne_bass_in_pairing_mode.pdfIn PDF document text
    • http://jokojujut.medianewsonline.com/larin_2_1_2_ton_floor_jack_manual.pdfIn PDF document text
    • http://mowefopovog.mywebcommunity.org/wewiwagowotokerujipit.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393626/normal_5fe35f7aedac3.pdfIn PDF document text
    • http://nuloriwilorij.scienceontheweb.net/how_to_connect_firestick_remote_to_control_volume.pdfIn PDF document text
    • https://kidenido.weebly.com/uploads/1/3/1/6/131636891/nivokuxizeme-vapug.pdfIn PDF document text
    • http://nemosixumeki.mypressonline.com/a_first_course_in_abstract_algebra_3rd_edition_solutions.pdfIn PDF document text
    • http://jozipuvuwuzaj.mywebcommunity.org/will_there_be_a_new_harry_potter_film_2020.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gafodix.myartsonline.com/why_is_the_bell_jar_called_the_bell_jar.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000264a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x264A5 5440 bytes
SHA-256: 835a14ac404217dfa58f3f0838ec0781feb12fe617e16ec0283c8266e8cc89ad
font_01_sfnt_off0002773a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2773A 16596 bytes
SHA-256: 4595b69590e14ea8e8a57080457a09879e731db8a74cc58f7c1126d4dc95ef1c
font_02_sfnt_off0002a77a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2A77A 16060 bytes
SHA-256: 99ddc6f5858eb134f8024171ebe717cbd02485c31471b921a5021903b5272953

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