Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfc94ab6141118e8…

MALICIOUS

PDF

77.4 KB Created: 2021-03-19 19:25:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 91149994cdf03c2f2893d7a1839c177f SHA-1: 0c5679d3f5ec5b0b463f5ea3defb9dfa8fe217e3 SHA-256: dfc94ab6141118e8db0b6a973801518294d50ad3f29454310a6cf525d102bccd
196 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm of external PDFs, with one redirecting to a lure page about 'Charger cable type for android'. The presence of numerous external links suggests an attempt to host malicious content or phishing pages, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://midufefew.ru/123?utm_term=charger+cable+type+for+android PDF link annotation
    • https://cdn.sqhk.co/zalivelo/0UjjhaJ/26679206830.pdfIn PDF document text
    • https://cdn.sqhk.co/bebomopakax/ePwQgiS/35909253545.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/memexelu/dutika.pdfIn PDF document text
    • https://s3.amazonaws.com/mamibis/bridal_bedsheet_buy_online.pdfIn PDF document text
    • https://s3.amazonaws.com/dufekifaral/taoist_quotes_chuang_tzu.pdfIn PDF document text
    • https://s3.amazonaws.com/seriposuj/update_android_6._0_to_8._0.pdfIn PDF document text
    • https://s3.amazonaws.com/zuvovoxigumuz/96039573154.pdfIn PDF document text
    • https://s3.amazonaws.com/golepe/rifes.pdfIn PDF document text
    • https://s3.amazonaws.com/muxozuvalubi/partially_anonymised_information.pdfIn PDF document text
    • https://s3.amazonaws.com/jukoxisojow/weider_pro_3200_home_gym_price.pdfIn PDF document text
    • http://kutubuge.rf.gd/free_hourly_work_schedule_template.pdfIn PDF document text
    • https://ef9d90ca-5811-4a1c-810e-75bcfae60121.filesusr.com/ugd/a33af7_439cf1e1b7574648a8a45742bb9e0e66.pdf?index=trueIn PDF document text
    • http://latilofu.rf.gd/26489703018.pdfIn PDF document text
    • http://karadefega.epizy.com/faxerusoderokomanode.pdfIn PDF document text
    • https://s3.amazonaws.com/tobobowu/game_burnout_pc_highly_compressed.pdfIn PDF document text
    • https://s3.amazonaws.com/xurixado/91401923308.pdfIn PDF document text
    • https://s3.amazonaws.com/navoburarovada/gategalasexaxenamexomuza.pdfIn PDF document text
    • https://71e5fc8e-cc9a-4633-96c3-2c70acd464d0.filesusr.com/ugd/f08e01_5b62626994d24f7fa9270755f66029ec.pdf?index=trueIn PDF document text
    • https://18e7ef82-5c75-44fe-ae22-4c356c2c9ce0.filesusr.com/ugd/749e61_a62625eeaf644addb6f88c1a91935d36.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/debamijizozexo/sims_3_complete_collection_mac_download_free.pdfIn PDF document text
    • https://s3.amazonaws.com/vonusirukete/how_to_fix_resistance_on_exercise_bike.pdfIn PDF document text
    • https://e6c529cc-411f-4195-b5ea-7b5fd081490a.filesusr.com/ugd/b7ab08_65f4ede10d654e988ea3803a14c6196e.pdf?index=trueIn PDF document text
    • https://601bead5-a720-4f65-98db-62fe2a42cb91.filesusr.com/ugd/0e52b4_a7b86611f8494ac5b786c139ebbd2a6d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dojivewobasuval/sap_tcode_to_view_outline_agreement.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_off0000efa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA8 5388 bytes
SHA-256: 42c2020b21594a8abbf822d8d5c00b4cae7ea822b00966ef021853a1bc960b7f
font_01_sfnt_off000101f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F8 10684 bytes
SHA-256: 8dc47196741c108584228adff3ff66f80d5394792923edc66e532e13eb8d115c