Malicious PDF — malware analysis report

Static analysis result for SHA-256 229bbf3e435b8cc9…

MALICIOUS

PDF

105.2 KB Created: 2021-03-31 00:40:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: f1473d8bf27618d62571988dfc1e430f SHA-1: b8bdc01031e5e36ad889d11205b2d6783642e670 SHA-256: 229bbf3e435b8cc9464a701a7be25bc614dbcd172b33a2022137658a22a2175d
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a link farm, suggesting a malicious intent to redirect users to potentially harmful websites. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were directly extracted, the PDF structure and embedded URIs point towards a phishing or SEO manipulation attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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 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://jacksth.ru/award?keyword=current+affairs+february+2020+pdf+affairs+cloud PDF link annotation
    • http://lupazul.mywebcommunity.org/bucket_list_book.pdfIn PDF document text
    • http://help-ruleviolation.com/best_lyric_video_maker_macgkpb1.pdfIn PDF document text
    • http://lixusopo.mywebcommunity.org/godufamugupajikijapivel.pdfIn PDF document text
    • http://vevufilusik.scienceontheweb.net/ginujovuturilaxafaz.pdfIn PDF document text
    • http://usblighter24.site/chocolate_girl_song_kannadaqwyvm.pdfIn PDF document text
    • http://tufofol.medianewsonline.com/how_long_does_it_take_to_settle_a_personal_injury_claim_in_ireland.pdfIn PDF document text
    • http://xerijegodufiw.mypressonline.com/bailey_and_love_27th_edition_free.pdfIn PDF document text
    • http://kdghy.online/48473382456oxokl.pdfIn PDF document text
    • http://demuxum.getenjoyment.net/pezapukako.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/4fd2c931-2454-484a-846c-477d97696863/bugetukojukam.pdfIn PDF document text
    • http://xuvekixofeku.onlinewebshop.net/edit_text_in_indesign.pdfIn PDF document text
    • http://wopojofa.atwebpages.com/alimentacion_en_el_embarazo_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f595e13-f633-4714-b5b8-ebf8e2e4b368/how_do_you_know_if_you_have_a_sinkhole_in_your_yard.pdfIn PDF document text
    • https://0f7a2101-273c-4f7f-b1fd-079d1ad923c1.filesusr.com/ugd/a7ea6f_0cccf38e0b68460784a25e4b1c23a9cb.pdf?index=trueIn PDF document text
    • http://wavexijazibivat.myartsonline.com/27064869896.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c8d08fa-6708-4781-8e51-26c523d240b8/el_reino_de_este_mundo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5a103d2-21f2-45a4-9b4f-ee6884621290/how_to_use_zoom_microphone_on_ipad.pdfIn PDF document text
    • https://627ea4a7-3f28-4bf3-8c99-6a9da7dacf48.filesusr.com/ugd/1970e2_e54010952e40497e9cfea226aeb6ec69.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/77684d36-d09a-41c2-b838-70ae6bb5b491/denon_avr_x2200w_price_in_india.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_off00014589.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14589 5568 bytes
SHA-256: 2d8cfaaac4b49fdb71e2c3297e08055f770581430b876ed1999857c715832769
font_01_sfnt_off0001588d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1588D 11644 bytes
SHA-256: 79a15b5f5b4a569997ccb1517a9dfa20feafeae66a6e0ba5d8fc124b4c0d44f5
font_02_sfnt_off00018071.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18071 16336 bytes
SHA-256: 5665185e49d4fa2b49996dc0469edb7b4416fa9228f945c916c9d329e2b947de