Malicious PDF — malware analysis report

Static analysis result for SHA-256 babf0f6975bab9d0…

MALICIOUS

PDF

87.7 KB Created: 2021-02-18 14:42:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 0d30c4d544b03093244bb308c423905e SHA-1: b71656da3703f7ec4a6341dea436f25cca805904 SHA-256: babf0f6975bab9d0bee76e4dce444b757bd36568a1998af2411f52193681ad86
194 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to the URL 'https://yafferge.ru/wix?keyword=how+solutions+form+worksheet+answers'. This URL is flagged as a malicious redirector, and the document's content and heuristics suggest a phishing or malware distribution lure. ClamAV also detected this file as 'Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://yafferge.ru/wix?keyword=how+solutions+form+worksheet+answers In PDF document text
    • https://cdn-cms.f-static.net/uploads/4485935/normal_602e2bf391eab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404524/normal_600f7e10d00ea.pdfIn PDF document text
    • http://xrootunited.com/dekubagowefanazabezeuntvh.pdfIn PDF document text
    • http://iuts.space/tenimiwonokgj69a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465565/normal_5fcf255015a24.pdfIn PDF document text
    • http://shopyou.online/l2d99.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/fuwenoxuzasila/solidworks_installation_files.pdfIn PDF document text
    • https://s3.amazonaws.com/zidosozawok/52082559972.pdfIn PDF document text
    • https://s3.amazonaws.com/pubopelej/76950791028.pdfIn PDF document text
    • https://s3.amazonaws.com/xesigeze/99046443725.pdfIn PDF document text
    • https://s3.amazonaws.com/fizaxo/gosiguz.pdfIn PDF document text
    • https://s3.amazonaws.com/pibabopuduj/logabumexoxadezepexud.pdfIn PDF document text
    • https://s3.amazonaws.com/fonibinaraj/unsweetened_banana_chips_nutrition_information.pdfIn PDF document text
    • https://s3.amazonaws.com/xewamejixolefaj/85028541753.pdfIn PDF document text
    • https://s3.amazonaws.com/kexamoxusinixu/towibilozezimemizem.pdfIn PDF document text
    • https://s3.amazonaws.com/bidemewufa/b._ed_cet_online_form.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010237.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10237 5124 bytes
SHA-256: db2e88dfb5f1b4334e103b3cb2306f30e8f1aa80ca9f046c429c497a2ef7e113
font_01_sfnt_off00011386.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11386 11364 bytes
SHA-256: ac8ee1d0d56d1bf74771fcfd684d79b1708b3e284838386336ee480e2875420e
font_02_sfnt_off00013a5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A5F 16120 bytes
SHA-256: b161a5acb761a64440fe2dd10292f99906b7d50c9241161731b394354e0a8b79