Malicious PDF — malware analysis report

Static analysis result for SHA-256 43af879d62cae262…

MALICIOUS

PDF

77.6 KB Created: 2021-03-24 03:50:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bd2b2fb506c3ec44ed61a1671a84d590 SHA-1: 78bed2e575fe44072945dcd44f39dc2875f28898 SHA-256: 43af879d62cae262273d507bc41fd92c9c0d48a56f92aa0df9c63dd1cb081610
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 pointing to Weebly and other free hosting services, suggesting a link farm or phishing campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://seumenha.ru/strik?utm_term=a+writer%2527s+reference+9th+edition+paperback
    • https://rujumimipadud.weebly.com/uploads/1/3/0/8/130874091/a8340a80.pdf
    • https://lujegasot.weebly.com/uploads/1/3/0/9/130969173/890767d2.pdf
    • http://xekusevaguviz.iblogger.org/26472919793.pdf
    • http://guwejusu.22web.org/xaxojosove.pdf
    • https://rejileju.weebly.com/uploads/1/3/4/3/134335231/11e75.pdf
    • https://wexarasi.weebly.com/uploads/1/3/4/3/134351888/zokuduxipu.pdf
    • https://zuzoperelalame.weebly.com/uploads/1/3/2/6/132683259/tubufazu.pdf
    • https://wavoxodasamemat.weebly.com/uploads/1/3/5/3/135348105/7341287.pdf
    • https://gabejopow.weebly.com/uploads/1/3/4/5/134597712/0e823906820.pdf
    • http://serinigemopige.22web.org/export_html_to_using_php.pdf
    • https://veworokog.weebly.com/uploads/1/3/1/6/131606039/mokabuvog.pdf
    • https://vumusubivabup.weebly.com/uploads/1/3/4/4/134491869/29f4917bc88373.pdf
    • https://tavifarexup.weebly.com/uploads/1/3/4/6/134611028/dasebitovigur_sujuxama_fizafabosapenuf_gonutovixikale.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/paxuvagal/nec_national_electrical_code_wikipedia.pdf
    • https://s3.amazonaws.com/bejokazemur/lazidavijavosifavomupev.pdf
    • https://s3.amazonaws.com/jovekus/bt_phone_says_line_in_use.pdf
    • https://s3.amazonaws.com/fajixe/poe_beastcrafting_guide.pdf
    • http://bekujefil.epizy.com/88558975274.pdf
    • https://s3.amazonaws.com/mupukesunobaga/microsoft_word_templates_business_cards.pdf
    • https://s3.amazonaws.com/ritoma/who_makes_tao_dirt_bikes.pdf
    • https://s3.amazonaws.com/fusidejebi/annual_credit_report_request_form_fillable.pdf
    • https://s3.amazonaws.com/pukiza/annabelle_3_2018.pdf
    • https://s3.amazonaws.com/xukonakefules/do_african_wild_dogs_eat_their_prey_alive.pdf
    • http://milibelibagusez.epizy.com/38891898198.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_off0000ef38.bin
2318a46a39f12844a339235662fe36b0cdb235d60759e3efc86f71fe7aedcb06		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF38 5684 bytes
font_01_sfnt_off0001029b.bin
2aad6b7c461697ef090c4f5dfc40b65a40f99014eb04e9c96cc37b9c213363b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1029B 10920 bytes

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