Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b6bc685c7e6f36b…

MALICIOUS

PDF

129.3 KB Created: 2020-12-25 11:13:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: cc730fc19ce6dc70b9bc26b93b2566fe SHA-1: 1e5bd46d9c246f2b6f3e496dceac50b24012ee28 SHA-256: 4b6bc685c7e6f36bffac8245516184e310b55f09918549a9787414ea9f545464
302 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains multiple heuristics indicating a malicious redirector and an advance-fee scam lure. It links to known malicious infrastructure and a PDF link farm, suggesting it's part of a phishing campaign. The presence of embedded URLs and the overall structure strongly suggest the document is designed to trick users into visiting malicious sites, likely for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 8

  • 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.
  • 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.
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://cctraff.ru/123?utm_term=driving+in+canada+in+winter In PDF document text
    • https://cdn.sqhk.co/sevimifogu/ibWgfUO/bemiwolekisabowukin.pdfIn PDF document text
    • https://cdn.sqhk.co/kebubupoxiz/ShpieWU/37536333011.pdfIn PDF document text
    • https://cdn.sqhk.co/susiwozobo/jhYeheo/phoenix_weather_hourly.pdfIn PDF document text
    • https://cdn.sqhk.co/tokititagiwe/cY6vhdO/nda_exam_date_2020_admit_card_download.pdfIn PDF document text
    • https://cdn.sqhk.co/kiranagel/iPhj1JC/naponoja.pdfIn PDF document text
    • https://cdn.sqhk.co/xufatirumina/gjRgHfO/2_emoji_1_word_game_answers.pdfIn PDF document text
    • https://mufedagejex.weebly.com/uploads/1/3/4/7/134726032/duxujapif_jumepolifi_luzilarumezo_zomiduxevow.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405674/normal_5fd1d17a89f05.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404730/normal_5fcf3bef2ef25.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/mejifavo/jagenorazigexuw.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/23760423824.pdfIn PDF document text
    • https://s3.amazonaws.com/mafavuzenoliki/fobanisukek.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/bahari_za_mashairi.pdfIn PDF document text
    • https://s3.amazonaws.com/turip/langrisser_soldier_training_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/sugowubuf/amazon_prime_video_old_apk_download.pdfIn PDF document text
    • https://s3.amazonaws.com/zetare/catheter_care_nursing_procedure.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_off0001bcdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BCDD 5048 bytes
SHA-256: b316de85981af221b21af67a54f1d3127e813e357e3670c3310e997c7278af5d
font_01_sfnt_off0001ce33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CE33 12460 bytes
SHA-256: 8170dbdcd1d6073ce20c793ca0567d569834d366ca84949cb9b53fb0431eb0c7