Malicious PDF — malware analysis report

Static analysis result for SHA-256 c115a0b1a3a745c2…

MALICIOUS

PDF

66.9 KB Created: 2021-02-14 15:57:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: f67e050083385645ff80591ce099747c SHA-1: 0619e2d3e24e08efb4d10f51192be99ca402a97a SHA-256: c115a0b1a3a745c2699d0f08a76f1d9b35242308b17209e129666e11e0fc2b35
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://yafferge.ru/wb?keyword=bartender%20ultralite%20argox In PDF document text
    • https://cdn.sqhk.co/xexerekija/g6ighiz/vejosawodexajajides.pdfIn PDF document text
    • https://cdn.sqhk.co/rivitovolu/OjijiaV/warplanes_ww2_dogfight_mod_apk_unlock_all_planes.pdfIn PDF document text
    • https://cdn.sqhk.co/lerapuraroke/cidlkYa/download_game_fruit_splash_mania_mod_apk_offline.pdfIn PDF document text
    • https://cdn.sqhk.co/jukunobegabe/hdggMig/14978975677.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479222/normal_5ffc71e7778ff.pdfIn PDF document text
    • https://cdn.sqhk.co/pixazizaze/7hdicMJ/netflix_price_increase_2019.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403271/normal_6027af2230add.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471509/normal_5fe1ac0910877.pdfIn PDF document text
    • https://cdn.sqhk.co/kegufamop/eqLrlid/80883237868.pdfIn PDF document text
    • https://cdn.sqhk.co/dixejetafap/bhfoJgd/801001656.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366057/normal_5fca7644e00fc.pdfIn PDF document text
    • https://cdn.sqhk.co/mozigizax/haJgd6G/cute_dog_puppy_hd_images.pdfIn PDF document text
    • https://tiwebusimevadeb.weebly.com/uploads/1/3/5/3/135346158/kikimajeroroz-nuxakali.pdfIn PDF document text
    • https://cdn.sqhk.co/kuvuwisarov/gjukZNx/38591417411.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/lopeteb/vimujunoju.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_off0000c8e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8E7 4932 bytes
SHA-256: b9d3f628f3e7fd0354384bb950bd117e7e9f3c0e9f9f56ba107612ad809ecb6b
font_01_sfnt_off0000d9c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C2 11336 bytes
SHA-256: 04210033d1f3c9dc222fe6b61921bf7648edb49b5e37cc878ea739bcf1fa642f