Malicious PDF — malware analysis report

Static analysis result for SHA-256 efafbf1df1100455…

MALICIOUS

PDF

85.5 KB Created: 2021-03-09 15:43:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 8539cede2a677d2890507a73d305f50b SHA-1: b9051e16621103ee1384092fcaa038d831eb8132 SHA-256: efafbf1df11004554f0d50e8083aae38267a611ee1971cd2aa2397a1e069cd25
126 Risk Score

Malware Insights

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

The sample is a PDF document flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to disposable domains or suspicious paths, suggesting a phishing or malware distribution attempt. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a link farm on disposable hosting, further supporting malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://botokaw.ru/wb?keyword=new%20yorker%20crossword%20december%2028%202020 PDF link annotation
    • http://predouche.xyz/masenokivivoximusumxaw3.pdfIn PDF document text
    • http://nadahul.ru/95714839242n4loi.pdfIn PDF document text
    • http://copyrightsupport-ig.com/mozufavanusogujeranu1sv31.pdfIn PDF document text
    • http://velesvoyage.ru/learn_russian_podcast_redditkr93h.pdfIn PDF document text
    • http://fdvsefwfrw.space/kopuxebizabompalbx.pdfIn PDF document text
    • http://yachts-4-sale.com/nejupaparakanovifijesdi1lc.pdfIn PDF document text
    • http://iclod.tech/vobujesevarobotifapogav1qdm.pdfIn PDF document text
    • http://mon-compte-cmb.best/pop_up_facebook_messenger_androidyvsaz.pdfIn PDF document text
    • http://yoga-italy.space/operations_research_taha_9th_editioneme1f.pdfIn PDF document text
    • http://idealicaitalia.website/97371485028ppf5h.pdfIn PDF document text
    • http://detonic-shop.website/history_timeline_of_the_bibleqjs2y.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rujugojokukasav.rf.gd/capture_one_pro_10_free_windows.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed0a18e5-5f65-4850-af81-6a6cb8012fce/42002563501.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/944533ec-24a3-4fde-bc22-2d98edc2a50c/dotapadoxo.pdfIn PDF document text
    • http://fokozagizek.rf.gd/82223010120.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4c34bd9-5910-44cb-9d29-a8cc0b64f4c9/what_sequence_should_the_marvel_movies_be_watched.pdfIn PDF document text
    • http://waverotefiwob.epizy.com/97928345728.pdfIn PDF document text
    • http://levigorofelo.rf.gd/49789667295.pdfIn PDF document text
    • http://gawekavadave.epizy.com/bigogurolu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be00c94e-e0b6-4afe-8644-60b71c87a867/bojuso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24f557b2-b90e-4282-a7de-83d42beb3a35/lion_the_witch_and_the_wardrobe_movie_cast.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_off00010a2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A2C 5680 bytes
SHA-256: f36bf5e4055096835b6cf6b2ae75bb0e301e3471bbfff1feb1e6edf05f1ec1a9
font_01_sfnt_off00011d91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D91 13552 bytes
SHA-256: 66eaf096bf0da150c6199cff15408a8a6c99be137e398831b05eecd9c7633530

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