Malicious PDF — malware analysis report

Static analysis result for SHA-256 50f73a227d6520e9…

MALICIOUS

PDF

78.2 KB Created: 2021-06-10 08:06:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: e1c9ad71ee62605fa736066bf4b5bc18 SHA-1: cd70e21ba9ad33efb706b379b1dd988c4ff6942e SHA-256: 50f73a227d6520e968fe8d5ef9a8534a371cce7c421e125d3e43f276441111fe
226 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded links, many pointing to disposable domains, and is flagged as a link farm. The primary URL, 'https://soxebez.ru/123?utm_term=counter+strike+1.+6++free+macbook', suggests a lure to download a game, which is a common tactic for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving exploitation of PDF vulnerabilities to redirect the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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.
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://soxebez.ru/123?utm_term=counter+strike+1.+6++free+macbook PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4421627/normal_603e8e6cb4a6e.pdfIn PDF document text
    • https://jikolugoxolij.weebly.com/uploads/1/3/1/3/131379047/xotanaraz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448542/normal_60b876386cf0a.pdfIn PDF document text
    • https://zipuboxovasabe.weebly.com/uploads/1/3/1/4/131483293/zanakemewanabif.pdfIn PDF document text
    • https://sibomidejuxeda.weebly.com/uploads/1/3/4/5/134599986/a200cd3547f035.pdfIn PDF document text
    • https://zamovolipizutuj.weebly.com/uploads/1/3/1/0/131070940/3629773.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369153/normal_605cb260dd5a6.pdfIn PDF document text
    • https://bosogafowobalo.weebly.com/uploads/1/3/4/6/134614472/7001369.pdfIn PDF document text
    • https://fifubinagate.weebly.com/uploads/1/3/4/8/134854053/tamavitozobiwak.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422136/normal_60109b185148a.pdfIn PDF document text
    • https://razosopowob.weebly.com/uploads/1/3/4/5/134509902/katolefut-madimepub-ruvikudag.pdfIn PDF document text
    • https://fiwebafifike.weebly.com/uploads/1/3/4/8/134885554/basefutagi.pdfIn PDF document text
    • https://poxozebirineba.weebly.com/uploads/1/3/4/4/134447173/sevatezuvigubub.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456699/normal_6002afe2e7378.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484623/normal_5ff867cfdf764.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/6af913ca-b933-4a6f-b925-ea206e6c50d7/focusrite_scarlett_solo_studio_3rd_generation_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48c3f9e8-1e90-4dae-90d3-220b37da1b7f/does_exercise_help_diastasis_recti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cbcaf973-cb58-4151-88db-44ad0ecc63e8/37168269050.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52abf506-f354-4c03-934a-db65a0134ea8/32727812642.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4df3d9cf-1f2b-4a10-bf5d-3e9f43b601f4/watch_my_friend_dahmer_online_free_putlockers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2493ae8d-fb96-4037-b1c3-f2579d591cea/thirty_one_eight_contact.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e8c3e79-7ac8-4c67-967a-adba9d916cba/space_related_full_forms.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_off0000e76b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE76B 5344 bytes
SHA-256: 4d80a19fd1f047a0a50ea07ca7881624b117fd6989250442080f9de5a1c5392f
font_01_sfnt_off0000f990.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF990 22024 bytes
SHA-256: 451bce4594a186d7409282f09b6c63983a7da6932d97681ae8242fe4eb84db22

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