Malicious PDF — malware analysis report

Static analysis result for SHA-256 56a96604d1efe87f…

MALICIOUS

PDF

80.3 KB Created: 2021-04-06 20:14:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 1bf79d2b7ef28c9a6ba19eeba1478117 SHA-1: 5738c78e9d41e37bf919c81dfa865ef569420fab SHA-256: 56a96604d1efe87f2a37f5ca27bf8e41b37090654c08b6e8b4c56ca03a8344f1
186 Risk Score

Malware Insights

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

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 0.9990

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://jumiwimov.ru/strik?utm_term=over+the+rainbow+mac+and+cheese+oprah PDF link annotation
    • http://study-english-02.space/41637672297uj34i.pdfIn PDF document text
    • https://sujujiga.weebly.com/uploads/1/3/1/3/131379538/rojesimekisizewit.pdfIn PDF document text
    • http://thiswaytovogue.com/being_on_time_quotes_and_sayings0ub02.pdfIn PDF document text
    • http://luxshop21.site/how_long_is_harry_potter_6_without_creditsn48cp.pdfIn PDF document text
    • http://sayfelengs.space/lozovujevolonigirulimovksmjg.pdfIn PDF document text
    • http://stankoff.org/how_to_make_a_mob_spawner_in_minecraft_bedrock_1.16ttrbx.pdfIn PDF document text
    • http://euroshopmn.space/python_cheat_sheet_for_competitive_programmingpw9mq.pdfIn PDF document text
    • http://basiditdcf.space/fishing_report_today_durban71827.pdfIn PDF document text
    • http://segway-wheelchair.ru/gerupy988c.pdfIn PDF document text
    • https://woxevodojagub.weebly.com/uploads/1/3/4/6/134623787/bemorunimibebumono.pdfIn PDF document text
    • http://ravasixojodari.mygamesonline.org/biosensors_book.pdfIn PDF document text
    • https://melezejezoman.weebly.com/uploads/1/3/5/3/135383670/ziweluxu.pdfIn PDF document text
    • https://bugalesatu.weebly.com/uploads/1/3/4/3/134309104/seriwenipolaka.pdfIn PDF document text
    • https://parafobosa.weebly.com/uploads/1/3/1/8/131857791/xonuzides-wowisemibi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6e229dea-1f83-4be8-8cd3-388eabd4f5e3.filesusr.com/ugd/1cfe37_8111ee6a4dac41f58dda0c481741d607.pdf?index=trueIn PDF document text
    • https://e86c6366-0652-46cb-9e1f-5633a133dba9.filesusr.com/ugd/510a18_4bc2772d93b745d78807e679ee44a235.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nojemi/to_all_the_boys_i_loved_before_book_2.pdfIn PDF document text
    • https://s3.amazonaws.com/zurovajij/kokoke.pdfIn PDF document text
    • https://59b17237-83b3-47c6-9d40-f547da5b0434.filesusr.com/ugd/827194_7fdaca32410e4f3f87e3517cc93373d2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tevomenil/9688705818.pdfIn PDF document text
    • http://nujugeteteda.myartsonline.com/sisapepebuwefetujun.pdfIn PDF document text
    • http://wumugajus.onlinewebshop.net/how_to_replace_samsung_j3_charging_port.pdfIn PDF document text
    • https://c7bff75e-0a19-4817-9d47-fca4cf08161b.filesusr.com/ugd/3b6424_5a39fd58b6e4432c91b4ece711df487b.pdf?index=trueIn PDF document text
    • http://dirulibas.onlinewebshop.net/mizowonot.pdfIn PDF document text
    • https://34ea5197-a9e9-4ba5-99bb-a7dd7aeba98b.filesusr.com/ugd/234f58_3009c6a8c7a44f7eb91e4a9b63a83670.pdf?index=trueIn 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_off0000fa27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA27 5600 bytes
SHA-256: 3c84fe9793b40dfc0ece9a0876219e3a0ac9711b20a24f7aba2ddbbdafb3758b
font_01_sfnt_off00010d0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D0F 11288 bytes
SHA-256: be53922ef4a01babcf1abf47017b3280c995440bc4f3a1dd39640bf3b014ea9c