Malicious PDF — malware analysis report

Static analysis result for SHA-256 309a77b5a36bed4c…

MALICIOUS

PDF

83.0 KB Created: 2021-04-22 11:09:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 9a7c7ca82e1ae0b4d16477a9420080c4 SHA-1: b35122588f748a53b7e91b3fe862b3d7e5142c67 SHA-256: 309a77b5a36bed4c2d012a37deabe1548b97865ba4121e1d1ac91c8c76d54890
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, including a prominent one disguised as a search result for 'best alan watts books reddit'. This pattern, combined with the 'PDF_SEO_LINK_FARM' and 'PDF_SEO_UTM_REDIRECTOR_LINK' heuristics, strongly suggests a phishing or malware distribution attempt. The ClamAV detection and ML classifier further support the malicious classification.

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://nipisod.ru/strik?utm_term=best+alan+watts+books+reddit PDF link annotation
    • http://jedusajinud.mygamesonline.org/how_heavy_is_a_4x4_round_bale_of_hay.pdfIn PDF document text
    • http://sesosorav.iblogger.org/yielding_of_steel_sheets_containing_slits.pdfIn PDF document text
    • http://wutugidejavazu.scienceontheweb.net/adivinanzas_de_animales_para_nios.pdfIn PDF document text
    • http://sodowetan.mywebcommunity.org/articles_examples.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gomitobovuni.rf.gd/lisuwedimimirejazizi.pdfIn PDF document text
    • https://s3.amazonaws.com/vapelurowar/conway_twitty_sheet_music_free.pdfIn PDF document text
    • https://41fe7446-7195-45c8-906d-de5e784989f9.filesusr.com/ugd/e02969_fad67e8528da4cd587743f0cbbfa9976.pdf?index=trueIn PDF document text
    • https://2bb9e989-9ce9-409f-aa8a-839f2ea8d3bf.filesusr.com/ugd/9f8cc2_4a04b16a8fee4447a77a52e9805a6be1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/libowebujakux/kaiserreich_russian_empire_guide.pdfIn PDF document text
    • https://6632aaff-1fe9-4f1d-acb3-7d444e457837.filesusr.com/ugd/ce4b7c_3cfb793801634fcc900a2155a3619097.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/samopakamefap/architectural_draftsman_resume.pdfIn PDF document text
    • https://s3.amazonaws.com/vigevot/tera_happy_birthday_audio_song_free.pdfIn PDF document text
    • https://f2fffe36-c7b4-4b88-9608-518dc6c14750.filesusr.com/ugd/950b2a_cca831e587c94a06b0a5b0452f5586ea.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/puretulenuza/mozimugukuxozixaga.pdfIn PDF document text
    • https://b4095e1f-5e43-4c35-8b28-ff0c3185c247.filesusr.com/ugd/9cc3de_286734da85c44c8492b7c4b979895e88.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fofeguj/c60n_circuit_breaker_datasheet.pdfIn PDF document text
    • http://donufuruwitij.atwebpages.com/viwugur.pdfIn PDF document text
    • http://liroporuki.myartsonline.com/online_banking_services.pdfIn PDF document text
    • http://lajirobodogew.epizy.com/28308700395.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_off0001074f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1074F 5164 bytes
SHA-256: 648de1ade0e17b31983fa4b0d9fb99ef291979ee0f4a3c40cb3e73728c706177
font_01_sfnt_off00011902.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11902 11152 bytes
SHA-256: 4fa7bd0e37b04715036f7a8aae849255369529f05b79c519f55eca2e9c101323

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