Malicious PDF — malware analysis report

Static analysis result for SHA-256 df9f7809b0d243dd…

MALICIOUS

PDF

82.0 KB Created: 2021-03-28 08:23:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 199ed7bfce85f501ffd8d61bd6017475 SHA-1: 105763a56a8bfbb382dadc3e237e3c3e8e432fb3 SHA-256: df9f7809b0d243ddb54f43c8c59346eab2e7e714c7030c9377ad533d1c780c62
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://seumenha.ru/strik?utm_term=how+to+recover+facebook+account+after+phishing PDF link annotation
    • http://dulexip.22web.org/using_latitude_and_longitude_worksheet_answer_key.pdfIn PDF document text
    • http://xoziduso.mypressonline.com/argumentative_essay_format_mla.pdfIn PDF document text
    • https://cdn.sqhk.co/xemugugafot/AyTjiFM/44355531313.pdfIn PDF document text
    • https://cdn.sqhk.co/nifodotiriru/ezjgji0/blast_beat_movie_2019.pdfIn PDF document text
    • http://jenupekob.iblogger.org/nixon_the_player.pdfIn PDF document text
    • http://tiwigibafofovit.iblogger.org/binder_divider_tabs_template.pdfIn PDF document text
    • http://rutevelafi.iblogger.org/expressionism_and_impressionism_artists.pdfIn PDF document text
    • https://cdn.sqhk.co/melobokodijo/WFgipgg/keximem.pdfIn PDF document text
    • https://cdn.sqhk.co/sebidurubuze/o1hjQhf/sup_multiplayer_racing.pdfIn PDF document text
    • http://muvepifare.mygamesonline.org/33894237263.pdfIn PDF document text
    • https://cdn.sqhk.co/gigemuji/hgwciHA/setoxan.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://s3.amazonaws.com/befafuni/siwutinitigelibajopizo.pdfIn PDF document text
    • https://s3.amazonaws.com/lanubili/34387587754.pdfIn PDF document text
    • http://mojajigutomikew.rf.gd/el_arte_de_hacer_dinero_audiolibro_completo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4502d724-1768-4350-b5e0-455d7e272884/lixej.pdfIn PDF document text
    • http://bededojobafepeb.rf.gd/modified_barthel_index_shah.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f33ddde4-b950-4751-9458-ab52f39309e1/tedivun.pdfIn PDF document text
    • http://dufobirufo.atwebpages.com/viral_gastroenteritis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f86191e9-f1e1-4f50-abc2-a0c1db21928f/how_to_start_freelancing_programming.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa94d556-ae22-4d81-908b-1eabacca693d/what_is_the_importance_of_teacher_and_community_relationship.pdfIn PDF document text
    • http://lenixad.epizy.com/62232780525.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://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f268.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF268 5564 bytes
SHA-256: 2ce3ffe0c0372af57c0f8cf0186b47a41d9779583bceb1afc7902636168701f4
font_01_sfnt_off0001055f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1055F 6068 bytes
SHA-256: 58b4873d33ac9fffaf45ed1a2312b8eb5fadf3b067e77f8cfe9e87095f6a7717
font_02_sfnt_off00011510.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11510 10724 bytes
SHA-256: 5ac48101b9e2dd736250b60e1f5d5bceae563e78ddd6b6b708c51a373b487bd8

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