Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c9f83117677915b…

MALICIOUS

PDF

68.6 KB Created: 2021-03-24 05:33:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 5780d933c416ce404c68f81e164284a6 SHA-1: 69f6838ea1b794c9ca9836971cc8832a5462ea14 SHA-256: 3c9f83117677915b755931d66f5c80d1cbd73565939ab412da5d2912af86b47f
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to other PDFs, suggesting a link farm or SEO manipulation tactic. ClamAV and ML classifiers indicate malicious intent, specifically flagging it as a phishing trojan. The presence of embedded URLs and the structure of the PDF strongly suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://leonvi.ru/award?keyword=revista+natura+ciclo+14b+2020+pdf PDF link annotation
    • https://cdn.sqhk.co/givefugonuw/pgjZVcD/kidodeporixanos.pdfIn PDF document text
    • https://cdn.sqhk.co/sivefuxonix/jfme66w/3327787498.pdfIn PDF document text
    • http://sun-italy.space/how_to_learn_to_read_tarot_cardsdpsrf.pdfIn PDF document text
    • http://acgmgroup.ru/wesorogazivorisogiatx8g.pdfIn PDF document text
    • https://mufabevazom.weebly.com/uploads/1/3/1/3/131382955/6808886.pdfIn PDF document text
    • https://cdn.sqhk.co/xojurolaruk/dZjiiey/disarm_a_bomb_crossword_clue.pdfIn PDF document text
    • http://coupons2020.info/zaxok788ym.pdfIn PDF document text
    • http://presentinsta.site/9750434150tctll.pdfIn PDF document text
    • https://nofogiso.weebly.com/uploads/1/3/1/3/131398128/fekef-zafaguxosilijo-movanobewiguzeg.pdfIn PDF document text
    • https://cdn.sqhk.co/loxowopiv/HzjjYHi/75766806111.pdfIn PDF document text
    • https://cdn.sqhk.co/lepagesali/uiynshd/ghost_rider_3_dawn_of_darkness_online.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/jamuluvuvava/8268872208.pdfIn PDF document text
    • https://s3.amazonaws.com/bulozor/wozelamu.pdfIn PDF document text
    • https://s3.amazonaws.com/xijalovelokolep/tovavugij.pdfIn PDF document text
    • https://s3.amazonaws.com/rodakarugupoko/free_ukulele_christmas_songs_with_chords.pdfIn PDF document text
    • https://s3.amazonaws.com/vebenok/wedding_announcement_template_free.pdfIn PDF document text
    • https://s3.amazonaws.com/panalipolifod/how_to_drain_bosch_silence_plus_44_dba.pdfIn PDF document text
    • https://s3.amazonaws.com/duzexefemosaxe/gilelerijunugaditivud.pdfIn PDF document text
    • https://s3.amazonaws.com/limepusotanal/maquina_singer_3116_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/xowasosuf/97728899558.pdfIn PDF document text
    • https://s3.amazonaws.com/viregujipowuru/64965152082.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_off0000cca7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCA7 5772 bytes
SHA-256: 5807036049947634538c5eee6167a0ea3bc913293d4af384e8ddb5650fe2a0ef
font_01_sfnt_off0000e067.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE067 10564 bytes
SHA-256: 1f8f3139fd281a26ef611214b7485bfa88f7ede8688d448676f83d5c0d7b4cbd

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