Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0b61575655f3407…

MALICIOUS

PDF

63.1 KB Created: 2021-03-02 01:57:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 697bff70ce2e812d92b134d3539f1b9b SHA-1: 865705fc939531267705ed169b84c08812892259 SHA-256: c0b61575655f3407c7f99e79e8dbe0646fd87d339c4df20778a7c7740f336217
166 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious intent, including suspicious and invisible links pointing to potentially malicious domains. The ML classifier and ClamAV detection strongly suggest this PDF is a phishing or trojan delivery mechanism. Although no scripts were extracted, the embedded URLs are the primary indicators of compromise, likely leading to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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/wix?keyword=true+metrix+air+manual PDF link annotation
    • http://kakolamilasaru.medianewsonline.com/nombres_para_nio_que_esten_en_la_biblia.pdfIn PDF document text
    • https://zojegidaluvimov.weebly.com/uploads/1/3/4/1/134109086/803433.pdfIn PDF document text
    • https://fularoxu.weebly.com/uploads/1/3/1/4/131452806/3f22282af3ce.pdfIn PDF document text
    • http://grigolia-studio.ru/99921899588xspcz.pdfIn PDF document text
    • http://manybigs.space/81925169032lc6zp.pdfIn PDF document text
    • http://natur-green.fun/descargar_boruto_naruto_the_movie_sub_espaol_megaf9kw4.pdfIn PDF document text
    • http://nigasheff.xyz/uc_mini_for_android_2._2._1zg5nn.pdfIn PDF document text
    • http://bestgirl69.com/bunofofosalonopuwst82e.pdfIn PDF document text
    • http://afracheat5.xyz/logitech_harmony_700_rechargeable_batteriesjee1q.pdfIn PDF document text
    • http://com-login8.xyz/the_importance_of_being_earnest_2002_online_freerrcjf.pdfIn PDF document text
    • https://lavafijaxeb.weebly.com/uploads/1/3/0/7/130740432/likokebafibinowajura.pdfIn PDF document text
    • https://cdn.sqhk.co/diwomijo/hjjehhf/flying_penguin_game_3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000bdfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDFB 4668 bytes
SHA-256: db7ac00742c1ed9b1805689577aa45807b19ef9b69cbd2deeb1aad262396949c
font_01_sfnt_off0000cdc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDC1 10100 bytes
SHA-256: 85ee72a5ac042ac905de9b879539e7f0d081b95dd55b5a8b82629ac2dc59afcf

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