Malicious PDF — malware analysis report

Static analysis result for SHA-256 91bb799119b3e11c…

MALICIOUS

PDF

83.7 KB Created: 2021-03-31 22:11:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: b42981de6edd901f86c70f75d571cdfe SHA-1: 5f7363e99099f8bdd61efaf4a82c9e3779fceb28 SHA-256: 91bb799119b3e11c570689e5934780da6ae9c459a2bc356cda145895cca8071f
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to Weebly-hosted PDFs, indicating a link farm designed for SEO manipulation or to host malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious redirection techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://bologen.ru/strik?utm_term=patty%2527s+charcoal+drive+in+ap+lit+answers PDF link annotation
    • https://nutagabe.weebly.com/uploads/1/3/5/3/135325028/biranimexebanov_navonulabek_runokafomute.pdfIn PDF document text
    • https://bojuwakuxejekur.weebly.com/uploads/1/3/5/3/135347713/7909639.pdfIn PDF document text
    • https://molisepav.weebly.com/uploads/1/3/5/3/135347716/gumileg.pdfIn PDF document text
    • https://zuwiliwiwira.weebly.com/uploads/1/3/1/0/131071082/fupenufibiw-kumeralegedi-tutegeji-xawupurufoje.pdfIn PDF document text
    • https://lugigotaxur.weebly.com/uploads/1/3/0/9/130969655/fokelebibetid.pdfIn PDF document text
    • https://povejuzulegaje.weebly.com/uploads/1/3/5/3/135301343/a5af517768396.pdfIn PDF document text
    • https://fojiwuduz.weebly.com/uploads/1/3/5/3/135309278/5117094.pdfIn PDF document text
    • http://jewigekavevexi.22web.org/mahalaxmi_calendar_august_2020.pdfIn PDF document text
    • https://wofexajolevesi.weebly.com/uploads/1/3/5/3/135302186/fezagopake-pebadagive.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/f6ca82f9-7412-47cf-8cd6-090b2b1008df/how_read_financial_statements_for_dummies.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/daab7e16-8997-40c9-a4cc-1218a5379191/efficient_r_programming.pdfIn PDF document text
    • https://s3.amazonaws.com/jobavo/asus_rt-ac68u_merlin_firmware_update.pdfIn PDF document text
    • http://bezafesu.rf.gd/vorakesimazofabirup.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxomigo/the_necklace_guy_de_maupassant_short_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5565f773-65d9-422b-99ec-732f53049e8b/11_day_diet_fat_loss_for_idiots.pdfIn PDF document text
    • https://s3.amazonaws.com/daraniwekamidir/jufobunosenuketu.pdfIn PDF document text
    • http://wagasegupoveduv.rf.gd/familienbonus_formular.pdfIn PDF document text
    • https://s3.amazonaws.com/viboxikuz/computer_sound_booster_free.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_off000106ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106EC 5452 bytes
SHA-256: fab5dd46aac55e4eb993244337352460bce978791f265e86792c20d1dfdedbe9
font_01_sfnt_off0001198e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1198E 11212 bytes
SHA-256: e9abc01a7edf1eade35b14652704b86f9d8559c2a876af6c4367906abd587f98

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