Malicious PDF — malware analysis report

Static analysis result for SHA-256 6842e8b5fd004538…

MALICIOUS

PDF

44.3 KB Created: 2020-10-17 19:48:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 7d9d4318532158ad6ef3e85debd87d79 SHA-1: e40f5b3778de0e7559f0160a0ff3378245eed914 SHA-256: 6842e8b5fd004538f67148d9030f7fec9a260a93b85ed7675af5e506455b3ecc
202 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://cctraff.ru/strik?keyword=cholecystitis+nursing+diagnosis In PDF document text
    • https://sesuwulot.weebly.com/uploads/1/3/1/4/131438847/fewit-latafele.pdfIn PDF document text
    • https://boguvetasitob.weebly.com/uploads/1/3/1/3/131380850/efb45fb9b.pdfIn PDF document text
    • https://sifizebutu.weebly.com/uploads/1/3/0/8/130814914/vagifemi.pdfIn PDF document text
    • https://besiwalufeg.weebly.com/uploads/1/3/2/6/132696214/lorunojat_pumamijel.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370066/normal_5f89ad55562f2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366337/normal_5f88ee3f86058.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0488/2065/0149/files/crescenta_valley_high_school_ranking.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9581/8397/files/xigefusig.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/3884/6359/files/ponokavanixijimewuse.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0494/5736/5159/files/kagan_reading_strategies.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/3486/1991/files/pigowivosisegolovev.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6551/5933/files/59782476342.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9315/5230/files/how_to_convert_atoms_to_grams_calculator.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/0175/9912/files/wagon_wheels_for_sale_in_texas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7ada191-583f-4c60-8028-8fa9146ec63c/96858962172.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c920ea8-5621-4551-b083-e3a014ef2873/rogeratotofezewesarilego.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/627c007c-5c6d-48b5-a190-2fe0ad31646e/28028787241.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e12eda14-c997-4ebe-b9a5-983abc06f076/64996011307.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ae0600f-c02f-41d3-978c-1f152d6a1758/jazug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7779bd3-7c97-45d5-a60c-e827a332f863/pathfinder_paladin_spells_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0cbf25c-d90d-423d-847f-3f68f2792df0/6670490543.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5627762-5b38-4ea4-a556-9a75db923af5/70316169692.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a152250-4c33-4bb8-b8f3-7c6309868805/63732357254.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_off00006fcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6FCF 5208 bytes
SHA-256: 01428808a45513ba42ac703c0d420d5d1f5b4a2d997ed46f5d63cedcf5554a04
font_01_sfnt_off00008179.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8179 10084 bytes
SHA-256: 1fbd6fb9ec879473dcf6abe396401fadb5cf5d75dc186b2eaa0bebfc7a3c3b8d