Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c70f4f3fad7a1d3…

MALICIOUS

PDF

77.9 KB Created: 2021-02-15 01:46:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-10
MD5: 60d8cfef72f7fcef4d7a8c179f7fa784 SHA-1: 38d102ed9a6dcacfa470108d905edc8bbad0ca79 SHA-256: 6c70f4f3fad7a1d3629f985bb73f07b76bdaaa47a312627594ca03bfcf7b6585
254 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://crophysi.ru/aws?utm_term=ortopedia+y+traumatologia+infantil+pdf In PDF document text
    • http://filanion.online/convertir_en_odtzm080.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4505363/normal_6025f54ebed81.pdfIn PDF document text
    • http://masito.space/celebrity_cruises_nz_phone_number2prhn.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474734/normal_60258637495f3.pdfIn PDF document text
    • https://ludiwutigavas.weebly.com/uploads/1/3/4/6/134697468/85816671a45.pdfIn PDF document text
    • https://tavadubamik.weebly.com/uploads/1/3/4/4/134473349/kitoro.pdfIn PDF document text
    • https://rapironid.weebly.com/uploads/1/3/1/3/131398378/zomowodet.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/donukadizolin/setegawit.pdfIn PDF document text
    • http://saveluvuwu.rf.gd/jagamenudozugaj.pdfIn PDF document text
    • http://watijosanowo.epizy.com/35236286517.pdfIn PDF document text
    • https://s3.amazonaws.com/dobesogum/rigegavajuxatunariw.pdfIn PDF document text
    • https://s3.amazonaws.com/fogibi/kosatedofebobabonud.pdfIn PDF document text
    • https://s3.amazonaws.com/bajuse/anualidades_simples_ciertas_y_ordinarias.pdfIn PDF document text
    • https://s3.amazonaws.com/somisilegex/saxon_math_algebra_2_answer_key.pdfIn PDF document text
    • http://vonanovab.epizy.com/currency_exchange_worksheet_tes.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_off0000f05b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF05B 5312 bytes
SHA-256: 748efc2c7f8c6b19ef4e5abf40d05cac42decfaa0476258b218870da3fd4fe7b
font_01_sfnt_off00010261.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10261 11752 bytes
SHA-256: d76921bc9b356728b0d7ee6c5b65166b18217359c4a66bbf58f7b6972f1d6b66

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