Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7798171bafb6c2e…

MALICIOUS

PDF

63.0 KB Created: 2021-02-05 19:12:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: fe4f6dc1ea812fa112fff90a54a99fc5 SHA-1: 776d940610faffa70cbf0ec1b9dd932d23c17c3b SHA-256: c7798171bafb6c2eb166d6583bfa769021625aa95940e7ca9ee41fdfe1d35363
156 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious phishing content. It contains a large number of external links, many pointing to Weebly and S3 domains, suggesting a link farm or redirection scheme. The embedded document body text is heavily obfuscated and appears to be junk data, but the presence of numerous external links is a strong indicator of malicious intent, likely to redirect users to phishing sites or download further malware.

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://maypoin.ru/123?utm_term=system+of+equations+elimination+method+worksheet+frog PDF link annotation
    • https://sudomudes.weebly.com/uploads/1/3/0/8/130874284/9450059.pdfIn PDF document text
    • https://cdn.sqhk.co/janonaset/gg7jdhj/36251980105.pdfIn PDF document text
    • https://dodapufil.weebly.com/uploads/1/3/0/8/130813701/toxalevoxu_sudex_toret.pdfIn PDF document text
    • https://cdn.sqhk.co/tinipuded/1sIABx3/43950615475.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479237/normal_600738cfec957.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462993/normal_5fdeaf59ac0e3.pdfIn PDF document text
    • https://cdn.sqhk.co/botuvawezej/hdhaJjj/my_dream_home_netflix_instagram.pdfIn PDF document text
    • https://cdn.sqhk.co/bewewojiwo/mGfZhac/download_bubble_shooter_panda_mod_apk_unlimited_money.pdfIn PDF document text
    • https://cdn.sqhk.co/wojeberupe/djeg2gc/gejewolu.pdfIn PDF document text
    • https://cdn.sqhk.co/pajazidif/ighbqib/download_stickman_fight_2_the_game_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/disegivoji/jggibAv/tourism_business_plan_examples_ppt.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469143/normal_5fee92409ffdd.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/vetamedisoz/sword_art_online_fatal_bullet_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/gewisetug/lagu_terdiam_sepi_nazia_marwiana_planetlagu.pdfIn PDF document text
    • https://s3.amazonaws.com/fonibinaraj/search_by_image_apk_file.pdfIn PDF document text
    • https://s3.amazonaws.com/zarevizebi/92364246897.pdfIn PDF document text
    • https://s3.amazonaws.com/welanisowari/dalalimiragasujetiwetalev.pdfIn PDF document text
    • https://s3.amazonaws.com/tarajix/calmato_alpha_40_trainer_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/bulikowexunepov/salavisufedek.pdfIn PDF document text
    • https://s3.amazonaws.com/suxuzubojut/stillborn_full_movie_free.pdfIn PDF document text
    • https://s3.amazonaws.com/xalexojaxipud/philakone_s_cryptocurrency_superstar_trading_guide.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_off0000ba7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA7E 5808 bytes
SHA-256: 2e3d904e462fad60fda643de6eb304500bfae4f689009af7f747d03b03b016a7
font_01_sfnt_off0000ce27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE27 9400 bytes
SHA-256: 0074953e39d7273cc8e8c778e80cf70d30d1c6c6141511a14f4dd55f18958b82

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