Malicious PDF — malware analysis report

Static analysis result for SHA-256 e81190a49191ef8b…

MALICIOUS

PDF

88.9 KB Created: 2021-01-21 17:00:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 56c4595aec4613e6a4098837d6562fba SHA-1: b37efe28b141d3deb492db242bf992a2517559cf SHA-256: e81190a49191ef8b5a9276cccb497ce261630c42691d2c5367631bf0fef15759
184 Risk Score

Malware Insights

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

The PDF contains embedded links pointing to known malicious redirector infrastructure, as indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains text suggesting a report, which is a common lure for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://traffine.ru/aws?utm_term=desc+dubai+khda+report In PDF document text
    • https://cdn.sqhk.co/tumosirewuw/ijbRZgd/21274413213.pdfIn PDF document text
    • https://cdn.sqhk.co/feletitami/4efijgc/jungle_village_seed_minecraft_pe_1._16.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458150/normal_5fd7b93224908.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409394/normal_6002c86e239e1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447278/normal_5fa8830011faa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414153/normal_5fbc61b843b68.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368226/normal_5f8c5d051b944.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460963/normal_5fbee2dc144eb.pdfIn PDF document text
    • https://cdn.sqhk.co/tuvameboroke/Hojihhc/youtube_new_short_video_app.pdfIn PDF document text
    • https://cdn.sqhk.co/jalixuwefes/hjUFicK/rollercoaster_tycoon_4_mobile_cheats_android.pdfIn PDF document text
    • https://site-1177531.mozfiles.com/files/1177531/ncaa_football_championship_2020_kickoff_time.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453743/normal_60041f4b51309.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423188/normal_5fc8f0ff18d8f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lavodusepigixu.rf.gd/betway_live_casino_apk.pdfIn PDF document text
    • http://sezusol.epizy.com/webpack_angular_template_loader.pdfIn PDF document text
    • http://mowesedapi.epizy.com/basketball_tryouts_flyer_template_free.pdfIn PDF document text
    • http://molutuganum.epizy.com/knightfall_season_2_parents_guide.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_off00011d4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D4F 5332 bytes
SHA-256: 4c6cfd4b445b2c6a42f4bceefd268fae5af6c2edc8ceab70c345228ca05ce9ad
font_01_sfnt_off00012f6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F6A 11316 bytes
SHA-256: 6f79437d1d78e50af2e9997a9cd50ff7bb1a952f6682e9ae81a234e59d7d5039

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