Malicious PDF — malware analysis report

Static analysis result for SHA-256 f20319a22e6650b3…

MALICIOUS

PDF

78.4 KB Created: 2021-03-11 10:45:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: bc94cc279259e2b9a58998eb54440c48 SHA-1: c86fa1a0debc412315966b38fb6444c8e8d58a95 SHA-256: f20319a22e6650b307b37386699ae1ef380402980294e153ee93d82ab2321363
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are SEO-themed, suggesting a link farm or spamming operation. The primary external URI points to a website that appears to be a search result page, likely intended to trick users into clicking through. While no scripts were explicitly extracted, the PDF structure and the ML classifier's high confidence indicate malicious intent, possibly involving JavaScript execution or exploitation of PDF vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 4

  • 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.
  • 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://jottigo.ru/wix?keyword=cross+examination+questions+for+medical+expert+witness PDF link annotation
    • http://gefosezidubajoz.scienceontheweb.net/nirijepekekig.pdfIn PDF document text
    • http://pemufosapakem.mypressonline.com/roralu.pdfIn PDF document text
    • http://dunodipike.sportsontheweb.net/nidave.pdfIn PDF document text
    • http://rakapugijumub.sportsontheweb.net/50398077433.pdfIn PDF document text
    • http://ninotekega.mygamesonline.org/9567675697.pdfIn PDF document text
    • http://mavigawika.scienceontheweb.net/cuales_son_los_sintomas_de_embarazo_de_gemelos.pdfIn PDF document text
    • http://kokulotasuz.mygamesonline.org/best_html_css_book.pdfIn PDF document text
    • https://bopilopuneliniw.weebly.com/uploads/1/3/5/3/135304065/39fd1a9a249676f.pdfIn PDF document text
    • https://jafuxudaxifi.weebly.com/uploads/1/3/0/7/130739212/kipenetalaxiro-fizozamiluk-pedazulam-rogen.pdfIn PDF document text
    • https://degitetebumike.weebly.com/uploads/1/3/1/8/131857056/sedud-jewavegon-nevovubowibow-riloxoposasazax.pdfIn PDF document text
    • http://vimabanu.sportsontheweb.net/68751634117.pdfIn PDF document text
    • https://jidakizunulub.weebly.com/uploads/1/3/1/3/131381167/7187259.pdfIn PDF document text
    • http://miraluvofizobe.medianewsonline.com/zazoxujurinikofopegitisun.pdfIn PDF document text
    • https://mumevukuzo.weebly.com/uploads/1/3/5/3/135327759/ziwatelusonenit_xujuf_vegesuduj.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/b4e1559f-f4ee-4279-9013-43fce09cf133/the_complete_electric_blues_guitar_method.pdfIn PDF document text
    • https://s3.amazonaws.com/bokexizometun/census_application_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/wetowuzuxit/royal_caribbean_alcohol_policy_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3135684f-5d20-4717-8787-cf93e2a9e23e/ronald_wright_a_short_history_of_progress_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/dalava/odd_thomas_2013_full_movie_sub_indo.pdfIn PDF document text
    • http://koriwironawuva.myartsonline.com/how_long_does_post_acute_withdrawal_last.pdfIn PDF document text
    • https://s3.amazonaws.com/petikamov/ados_scoring_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/wifiduxezo/30433314744.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6148891f-6dcc-4429-80a3-27d269dcc9d8/75320969994.pdfIn PDF document text
    • https://s3.amazonaws.com/ragejufa/cuisinart_coffee_grinder_maker_how_to_use.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f32f82f-e7e5-432f-b1f3-10706cabe77d/1470891093.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de73fcfe-5aa5-476c-872c-eeb081d2894f/is_narnia_4_coming_out.pdfIn PDF document text
    • https://s3.amazonaws.com/wujodibu/ribopu.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A0 5492 bytes
SHA-256: ed632b59516a84aa53dda77d628e408a88945e6d50cc3cb4c5e5a77ea7c99147
font_01_sfnt_off0001034b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1034B 11232 bytes
SHA-256: 218437e0f07650e62eb3a764c6bce53afdc6ee3a30ff3dc4b10b2f043593a255

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