Malicious PDF — malware analysis report

Static analysis result for SHA-256 77079a36f6d540d0…

MALICIOUS

PDF

73.1 KB Created: 2021-02-14 12:54:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 80c979227423dcc1b27c0dbfd21e2202 SHA-1: 6ab79d11d31420a23e50264fe822e180569ea8c0 SHA-256: 77079a36f6d540d01606835ff505ee6e23a006d016fb781071ad89b0e83ac339
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 suspicious domains, indicating a link farm or phishing attempt. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' strongly suggest the document's purpose is to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://seumenha.ru/123?utm_term=ina+garten+pumpkin+pie+review PDF link annotation
    • https://cdn.sqhk.co/vizelupavew/dJwjDjc/rogue_legends_game.pdfIn PDF document text
    • https://cdn.sqhk.co/lexijunibul/ejbicCF/rudizigelajowisugewad.pdfIn PDF document text
    • http://lnstagaram-verifiedbadges-from.com/modawiwdzoa.pdfIn PDF document text
    • http://drenajkrasnodar.ru/8_planets_of_the_solar_system_pptm209g.pdfIn PDF document text
    • http://avtoshtorki.shop/dovofidamasewitatawixunedp6dt.pdfIn PDF document text
    • https://cdn.sqhk.co/kosifodalab/njdjhid/80s_love_songs_hits_list.pdfIn PDF document text
    • https://rupasofo.weebly.com/uploads/1/3/4/8/134892789/bizezazobukobu.pdfIn PDF document text
    • http://lazadacostumercenter.com/mtv_unplugged_in_new_york_nirvana4x2ty.pdfIn PDF document text
    • http://invitesistem.ru/sniper_ghost_warrior_2_walkthrough_part_1kfk10.pdfIn PDF document text
    • https://zuxadozi.weebly.com/uploads/1/3/4/6/134662888/dasuje_kopazuzumonumor_tofop_pokojoxutarurel.pdfIn PDF document text
    • https://revoninutilira.weebly.com/uploads/1/3/5/3/135338282/jifezajenojutupepe.pdfIn PDF document text
    • https://bemetezebore.weebly.com/uploads/1/3/4/8/134882820/lafalasi-vuxowadugebe-muridumifesuzo-xegajevemuxa.pdfIn PDF document text
    • https://cdn.sqhk.co/gukugifixija/hcggXic/vmotion_glitch_video_editor_maker.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jitimesolagun/anabole_dit_lebensmittel_liste.pdfIn PDF document text
    • https://s3.amazonaws.com/muxegeza/wheel_of_time_book_12_stealthgerbil.pdfIn PDF document text
    • https://s3.amazonaws.com/ropuba/favatoweva.pdfIn PDF document text
    • https://s3.amazonaws.com/paropabaru/i_am_barbie_girl_song_mp4.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_off0000e240.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE240 5084 bytes
SHA-256: af5b74541bf73b1e322a289351f08a681d164eeb7d99176ee35b23439c94d7ff
font_01_sfnt_off0000f393.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF393 10780 bytes
SHA-256: d25c22035624e947874143fcaeef67b2a1fb4647d76621fd10f409fc42e2556e

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