Malicious PDF — malware analysis report

Static analysis result for SHA-256 404506f4b34da184…

MALICIOUS

PDF

73.6 KB Created: 2020-11-17 05:45:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 39ca84cd74d5b6206711f3f1886f495c SHA-1: 9fc103461811fc9568039e03624612289dacd965 SHA-256: 404506f4b34da184b06fa341ad7a201f63499d56237b61f102d6c8e96d6b2570
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, many of which point to redirectors. The primary redirector URL is 'https://traffnew.ru/123?utm_term=combined+gas+law+practice+worksheet', which is likely used to deliver a phishing or malware payload. The ClamAV detection and ML classifier strongly indicate malicious intent, consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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.
  • 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://traffnew.ru/123?utm_term=combined+gas+law+practice+worksheet PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4447906/normal_5fa4863172d03.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419424/normal_5fa980bf201a7.pdfIn PDF document text
    • https://bedizegoresupa.weebly.com/uploads/1/3/1/3/131379398/dbbd04.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428062/normal_5fa3f31318c2a.pdfIn PDF document text
    • https://zonuloxovuge.weebly.com/uploads/1/3/4/4/134469127/tupijunegivivus_nijudam_lewafesunod_tonepimakuzi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412388/normal_5f936b3fc1ba6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366958/normal_5fa6c32223a75.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369768/normal_5f886162b5b56.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/ee9d61fc-e1bc-40c8-bd9c-3b914f892d39/zubivipadugerapoxesifi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b30e0b01-13a3-4b8f-af3d-764567c9ff90/libros_para_nios_gratis.pdfIn PDF document text
    • https://s3.amazonaws.com/xidulumexi/pamiwawuvukodejiv.pdfIn PDF document text
    • https://s3.amazonaws.com/baxekojojexusol/bubble_tanks_4_unblocked.pdfIn PDF document text
    • https://s3.amazonaws.com/regovadeje/portfolio_recovery_associates_llc_jobs.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0CF 5592 bytes
SHA-256: a8a8969b341ba287abdf49488381e2379fe8b8150eba5dfd9898d7cdc5231575
font_01_sfnt_off0000e3b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B3 12332 bytes
SHA-256: c1aceb2bcff531d7d0c8a8d21825aafb9c8a6ef1a53a00d88e929ec7ce6f3e28
font_02_sfnt_off00010b86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B86 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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