Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a71fe127f9d83b8…

MALICIOUS

PDF

81.3 KB Created: 2021-02-16 09:58:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 90f6821d18b845b39164b55e0d9d8ab7 SHA-1: 6d5278b65cc40cf76790756123c578d53fa5c9a3 SHA-256: 6a71fe127f9d83b8fcc8c67efbb1e6e20b888da03793df918360a0544160c3be
262 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • 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://yafferge.ru/strik?utm_term=criminal+lawyers+nyc In PDF document text
    • https://cdn-cms.f-static.net/uploads/4465688/normal_602346852688b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387581/normal_6029f4e3c752c.pdfIn PDF document text
    • https://dezuvamugofa.weebly.com/uploads/1/3/4/1/134131805/nekimez.pdfIn PDF document text
    • https://cdn.sqhk.co/libavesonon/UkjajjR/learn_python_programming_masterclass_freetutorials.pdfIn PDF document text
    • https://cdn.sqhk.co/nezafomura/n2Xjghi/90994506672.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484624/normal_600304a1e4385.pdfIn PDF document text
    • https://cdn.sqhk.co/dudugetogi/egihjhi/escape_plan_4k_review.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479254/normal_5fd91f51d76a5.pdfIn PDF document text
    • https://cdn.sqhk.co/bomumuxa/4wgiPjc/last_day_on_earth_survival_pc_game.pdfIn PDF document text
    • https://cdn.sqhk.co/xovikojux/cMUhfNH/splash_lagoon_deals_groupon.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476566/normal_600a6861d7bb5.pdfIn PDF document text
    • https://dolunejasuvufa.weebly.com/uploads/1/3/0/7/130776008/5477404.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380543/normal_5fef12ae552b5.pdfIn PDF document text
    • https://cdn.sqhk.co/dosojegomugu/g5eggjj/real_football_2015_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475859/normal_6002a07e634ca.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370052/normal_5fe1819feaedf.pdfIn PDF document text
    • https://cdn.sqhk.co/sugezigo/heuhagi/commander_in_chief_demi_lovato.pdfIn PDF document text
    • https://cdn.sqhk.co/wezufunin/hfjaG1z/aau_basketball_teams_rankings.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00010358.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10358 5044 bytes
SHA-256: 84a3d12c48d9535d541fc4422d1f70cca7c0c10ad675233d003946686996715c
font_01_sfnt_off00011474.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11474 10504 bytes
SHA-256: 25c73fe9d6a7388479cc7306f6159033febb839e9d2a736cdb161e4dabacf28c