Malicious PDF — malware analysis report

Static analysis result for SHA-256 b379212e0b55f735…

MALICIOUS

PDF

83.9 KB Created: 2021-03-15 01:20:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 24c9bf42ebacb1a0e1c58848f5480dac SHA-1: de342e1184855fad2bf59efa0b8227852a1e42dc SHA-256: b379212e0b55f73566217d413f7052d246203daef054820887cb71f58d754aaf
194 Risk Score

Malware Insights

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

The PDF contains critical heuristic firings indicating it links to known malicious redirector infrastructure. The ML classifier also strongly flagged this PDF as malicious. The embedded URLs, particularly the one leading to 'yafferge.ru', are highly suspicious and likely serve as the initial lure to a phishing or malware distribution site. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/wix?keyword=telluride+2020+vs+2021 In PDF document text
    • http://futup.ru/memuxixofigexodm9ic8.pdfIn PDF document text
    • https://cdn.sqhk.co/lanuniwa/eTEKczK/moripa.pdfIn PDF document text
    • http://shmelev.pro/why_does_my_clothes_washer_smell_like_sewerppbzf.pdfIn PDF document text
    • https://cdn.sqhk.co/poronujefino/jJhegc3/derejufekanejimalav.pdfIn PDF document text
    • http://jakartapro.xyz/how_long_does_it_take_to_charge_panasonic_eneloop_batteries6ifv1.pdfIn PDF document text
    • http://cashtanks.fun/tonetedetodm765.pdfIn PDF document text
    • https://cdn.sqhk.co/solijisivono/mjjXidA/25383423694.pdfIn PDF document text
    • http://organicsss.space/how_we_decide_book_reviewa5juf.pdfIn PDF document text
    • http://123dutch.com/premiere_pro_cs6_effects_free_download2btb9.pdfIn PDF document text
    • http://ubzvp.com/the_babylonian_talmud_exposednslqr.pdfIn PDF document text
    • https://cdn.sqhk.co/vopofuxo/8gejaig/donigigo.pdfIn PDF document text
    • http://ig-copyrightnotice.com/xukorupoxinasusodexeburfztd5.pdfIn PDF document text
    • http://sallles.ru/7_days_to_die_garage_doorzjqcb.pdfIn PDF document text
    • http://krokoboko3.xyz/christmas_carols_lyrics_and_chordsn8a3h.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://1fc3e790-19e1-43b7-bae7-d09a953f51fe.filesusr.com/ugd/2c608b_8f4f1acac2564bbbb2e62edb1c61464d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/guwutivupudutu/47324066839.pdfIn PDF document text
    • https://s3.amazonaws.com/jadudusujuje/77295014578.pdfIn PDF document text
    • https://s3.amazonaws.com/pulavokaxe/67863045056.pdfIn PDF document text
    • https://275320ff-96dd-455a-9699-a0fdc58b27a5.filesusr.com/ugd/943725_760d575181834a7da7d6f64391dff10f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zidenigad/vurew.pdfIn PDF document text
    • https://dd3528e8-ded0-4753-843e-0d3cb9f542e7.filesusr.com/ugd/4d6844_4d72dd52b59d42aeabc3d326dea326f0.pdf?index=trueIn PDF document text
    • https://a95edb9d-21e5-46e4-bb1b-b1fdf66a5dae.filesusr.com/ugd/09e34a_69737f01a3f04a7094775c5996b8b060.pdf?index=trueIn PDF document text
    • https://97783159-ced7-426e-9fbd-60d2bb3342fb.filesusr.com/ugd/00058f_48b884eca2c84273a9ba8b5b509c5663.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/votuweroxigezog/antennas_direct_clearstream_4_manual.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE98 4532 bytes
SHA-256: 63de23b568c8517c5bc04ba718ac701c793c386ef3a825b8289ded83cfb69877
font_01_sfnt_off00010e07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E07 10704 bytes
SHA-256: 3d68006a9d4174d110f47e7ee9ff0a5c1c556ec36d66e5e61d31f4ec41a69750
font_02_sfnt_off00013269.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13269 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230