Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ebeadba25e274de…

MALICIOUS

PDF

75.6 KB Created: 2021-03-04 03:19:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 1a0de08706a9d70fa41ea83fe0d466da SHA-1: 934e596025c52c40ee3e8c8fc817cc15ecd8c4d2 SHA-256: 4ebeadba25e274deae2188efa9bd5427357c0a4ad77046a96f37fda6debc1853
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. ClamAV and ML classifiers identified this PDF as malicious, specifically as a phishing trojan. While no scripts were explicitly extracted, the presence of numerous external URLs suggests the potential for downloading further malicious content or redirecting users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://gimoguvi.ru/award?keyword=how+to+solve+an+isosceles+triangle+angles PDF link annotation
    • http://burrrhey.tech/ahlan_wa_sahlan_textbook_2nd_editionu6s9f.pdfIn PDF document text
    • https://cdn.sqhk.co/besiwowegin/hjpJrjb/311348783.pdfIn PDF document text
    • https://rijokurep.weebly.com/uploads/1/3/4/3/134377239/jugorowokupizozu.pdfIn PDF document text
    • https://gumosoxegobekij.weebly.com/uploads/1/3/3/9/133999275/wawepaziwati_bedefes.pdfIn PDF document text
    • https://cdn.sqhk.co/zutigaku/MmxThh4/scrap_em_alien_invasion_defense_attack_strategy_2018.pdfIn PDF document text
    • http://faxusupovetek.sportsontheweb.net/is_indian_food_diabetic_friendly.pdfIn PDF document text
    • https://momigetufi.weebly.com/uploads/1/3/4/8/134876151/xeromatanod-masojojarekonu-vevijak-wamipanilo.pdfIn PDF document text
    • http://zugugalepew.mypressonline.com/how_much_is_the_tesla_model_3_performance.pdfIn PDF document text
    • https://tufemetu.weebly.com/uploads/1/3/4/8/134887907/ginawimedovuve-taguwetoze.pdfIn PDF document text
    • https://cdn.sqhk.co/xedogigiloli/fihk49z/palokuladafotuxanoreke.pdfIn PDF document text
    • https://cdn.sqhk.co/nozedimasav/BKhgsib/monapanexodu.pdfIn PDF document text
    • https://pixamowogiru.weebly.com/uploads/1/3/4/5/134590731/vitozolazogifi.pdfIn PDF document text
    • https://zupakikaxabu.weebly.com/uploads/1/3/1/3/131380404/kewetejirekekagege.pdfIn PDF document text
    • https://cdn.sqhk.co/poxirowo/bia6Pji/widaboxilevepobuwajibijaz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kikanelomer.onlinewebshop.net/58878153786.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d812.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD812 5080 bytes
SHA-256: 7b9e48d574f226a9fe3f6428925fb507742160f3ac97f9ee7595089842e9cafe
font_01_sfnt_off0000e982.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE982 10208 bytes
SHA-256: 196b1d6f9a72eb0060d58a52b58e55643c919b5c9f0a43618618008d958fe1fb
font_02_sfnt_off00010caa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CAA 16072 bytes
SHA-256: 4ce97752c8d1ed0b0302a1507788019c6b738cc3ee96ca273f61f92c287db7cd

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