Malicious PDF — malware analysis report

Static analysis result for SHA-256 411e963c9319afc0…

MALICIOUS

PDF

82.5 KB Created: 2021-04-05 14:09:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 81718010c82431847c3fc2472d183bf0 SHA-1: 911b20598e9e15c8d4397b90c30af45b7c7256d3 SHA-256: 411e963c9319afc0e052ca0436ed81c3b0805bbec672bc83975f72aad3b0260e
254 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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/strik?utm_term=which+score+is+better+act+or+sat In PDF document text
    • http://pshcomonhere.xyz/postman_usage_guide0qrpd.pdfIn PDF document text
    • http://gukevipagopu.mywebcommunity.org/advocates_remuneration_order_2020.pdfIn PDF document text
    • http://securitycheckingbrowservkcom.xyz/4th_grade_grammar_practiceaq7y0.pdfIn PDF document text
    • http://netewe9.xyz/34160127775ovx3d.pdfIn PDF document text
    • http://tepoparupomo.medianewsonline.com/couch_to_5k_running_plan.pdfIn PDF document text
    • http://zabovawupe.mypressonline.com/fezizanorepogajupab.pdfIn PDF document text
    • http://dabezogo.22web.org/dofikunu.pdfIn PDF document text
    • http://top-shop-store.website/jekagepifs20f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dasupepu.epizy.com/object_oriented_programming_concepts_java_ppt.pdfIn PDF document text
    • https://s3.amazonaws.com/lokijuronig/uc_browser_java_application_free.pdfIn PDF document text
    • https://6d4cd3b7-91e9-43ac-92b9-205473f1e50d.filesusr.com/ugd/28146e_851ebb33bf5e45f1b84e0b2a9728bf46.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pokorevalaxex/harry_potter_movies_order_of_the_phoenix_cast.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxepiduded/cisco_webex_add_on_windows_7.pdfIn PDF document text
    • https://s3.amazonaws.com/zuvovoxigumuz/tv_guide_dstv_supersport_4.pdfIn PDF document text
    • https://62bfe9e3-d01a-456c-9d14-3ac71290fd99.filesusr.com/ugd/cfe640_f5ac7e5e5e204b87b976881d5b3c4b19.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/votuweroxigezog/para_angariar_fundos_de_formatura_os_cadetes.pdfIn PDF document text
    • https://3b0fe5ff-7f86-489c-8138-fc984e51136c.filesusr.com/ugd/bfd78a_b65ceb1b4e254d7fbfef9d950601c8e3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gozifep/22186202430.pdfIn PDF document text
    • https://43cb2d18-1589-43a7-b1c5-fe1278e1c76d.filesusr.com/ugd/370b54_8a7b66463df040018a71679e7769d99c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xilasisefi/messenger_old_version_ios.pdfIn PDF document text
    • http://jaweratiz.atwebpages.com/definicion_de_polisacaridos.pdfIn PDF document text
    • https://s3.amazonaws.com/viromibukoleliw/36131793708.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_off000103ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103ED 5008 bytes
SHA-256: 15f1e6fa381d25325cc3124ead41115f521e3c175591601ad899187d0c0cdf29
font_01_sfnt_off000114ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114FF 11308 bytes
SHA-256: 6fbedd7e2add013e40d8ec51577bc51f7a45c996134d87113765e008674b73bf