Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5b334ec776ae3c4…

MALICIOUS

PDF

75.8 KB Created: 2021-03-28 21:16:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 314c3532fbd49b02aae730ce5c13a667 SHA-1: a89748128145caa8443240a7bc2529d484618b88 SHA-256: d5b334ec776ae3c4077c8f39cd12e3badb47f23e22c912be2c9368a3ae1dd797
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 other PDF files, indicating a link farm or SEO spamming technique. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. The embedded URLs are the primary indicators of compromise, directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://maypoin.ru/award?keyword=paulo+coelho+libros+pdf+11+minutos
    • https://cdn.sqhk.co/jafakitiw/jbihoif/horace_silver_peace_lead_sheet.pdf
    • https://cdn.sqhk.co/vuwipabobatu/fdgdYja/69199809019.pdf
    • https://mibokedizigabu.weebly.com/uploads/1/3/1/4/131437832/ripozame.pdf
    • https://talosemes.weebly.com/uploads/1/3/4/4/134494853/94474f61e2960.pdf
    • https://cdn.sqhk.co/podoxato/tidwhjM/xuvija.pdf
    • http://sawemawe.mywebcommunity.org/8467954663.pdf
    • http://lezirumari.sportsontheweb.net/canon_6d_mark_ii_specifications.pdf
    • https://cdn.sqhk.co/lepavenujal/utha22L/ben_10_heroes_mod_apk_unlimited_money.pdf
    • http://newutatokulu.getenjoyment.net/catskills_hiking_map.pdf
    • http://zoguponuwuxoli.medianewsonline.com/vuvopuvomedifa.pdf
    • https://sasominafa.weebly.com/uploads/1/3/4/3/134362810/vibonomokoper_galuw.pdf
    • http://jenuxijaf.mygamesonline.org/sifinatotanov.pdf
    • https://cdn.sqhk.co/pofadugilip/hhifib8/colossal_cave_adventure_game.pdf
    • https://norofuzalugegok.weebly.com/uploads/1/3/4/8/134882219/5649467.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://nujilexulajuwup.atwebpages.com/bharat_acharya_8051_notes.pdf
    • https://s3.amazonaws.com/bovenotojitowe/98707618572.pdf
    • https://s3.amazonaws.com/rumezo/psat_raw_score_conversion_chart_2020.pdf
    • http://bejanifezilo.atwebpages.com/behavioural_questions_and_answers.pdf
    • http://kosezofejesuxef.atwebpages.com/wonder_novel_study_questions.pdf
    • https://s3.amazonaws.com/pizivurapab/29280169106.pdf
    • https://s3.amazonaws.com/bevarolimesale/zapomesiwuv.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e724.bin
fc79fed8133e867d673f7bf64989efa4a28e352cf24265d3920fd34fa5686a12		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE724 5588 bytes
font_01_sfnt_off0000f9f8.bin
0218a24ac093f7566cdc4da96a4d2b4b80fac1940f9643d1d6958a9e60152754		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F8 12252 bytes

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