Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b6078d4cb529818…

MALICIOUS

PDF

75.6 KB Created: 2021-03-04 15:32:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 9b943848e3522410f418ff05c3fc69b7 SHA-1: f14145680d337af6dc10b7d6049bc3be6e859fdc SHA-256: 9b6078d4cb529818493849ddff9fad6623a2a3700de3ec90f47266b360c66f7e
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 are to benign-looking PDF files, suggesting a link farm or SEO poisoning tactic. One primary URL, https://jottigo.ru/strik, is flagged as unknown reputation and is likely malicious. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

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://jottigo.ru/strik?utm_term=emotions+wheel+printable+pdf PDF link annotation
    • https://sinekamawo.weebly.com/uploads/1/3/0/7/130776883/levufalakirelavaz.pdfIn PDF document text
    • https://magirakikepemun.weebly.com/uploads/1/3/4/0/134000039/486072.pdfIn PDF document text
    • https://derivasip.weebly.com/uploads/1/3/1/4/131407068/sovevax-sotijuse-faduwe-kowogepaduf.pdfIn PDF document text
    • https://favexolifuluk.weebly.com/uploads/1/3/6/0/136092880/eee4cccaaa77.pdfIn PDF document text
    • https://vifefafu.weebly.com/uploads/1/3/4/8/134876142/fufupa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nejesezape.myartsonline.com/sowetuwulopusobeli.pdfIn PDF document text
    • https://s3.amazonaws.com/wizedumi/kuzegam.pdfIn PDF document text
    • https://s3.amazonaws.com/tesapibebujep/hamraaz_app_3._6.pdfIn PDF document text
    • http://pojozija.onlinewebshop.net/sylvania_portable_dvd_player_charger_walmart.pdfIn PDF document text
    • https://s3.amazonaws.com/gekixadonuru/begogax.pdfIn PDF document text
    • https://s3.amazonaws.com/povodijirig/arapca_ogrenmek_istiyorum.pdfIn PDF document text
    • https://s3.amazonaws.com/tolivajupeku/positive_words_that_begin_with_p_to_describe_someone.pdfIn PDF document text
    • https://s3.amazonaws.com/zafibimutadoti/goravites.pdfIn PDF document text
    • http://bavotuvezomevi.myartsonline.com/58111599984.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a24c92fa-7c71-485c-901c-bc269a3b2664/68083794995.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba2206c2-b5aa-4f2e-ac2f-d17a06c51a10/los_juegos_del_hambre_1_pelicula_completa_en_espaol_latino_facebook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c8417d9-c242-4382-a4c7-e8091fed5c42/toto_washlet_c200_review.pdfIn PDF document text
    • http://pikubub.onlinewebshop.net/aircraft_maintenance_technician_jobs_canada.pdfIn PDF document text
    • https://s3.amazonaws.com/fifomi/moxevu.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_off0000eb1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB1F 5468 bytes
SHA-256: 1210bf666afb55e6b72677a835fbc41676a36ffcd8fc8c1a8187e2af015ea695
font_01_sfnt_off0000fd94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD94 10468 bytes
SHA-256: d8dca112691113589bd0c9099127d53d221a322b142435f3131b723892fa9625

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