Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed8d117a890e7c47…

MALICIOUS

PDF

73.2 KB Created: 2021-03-17 05:15:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8c9d9a22d39485d36e50c6326742240e SHA-1: 88d5001a29816f18eef44f5c015edc16fe18edb6 SHA-256: ed8d117a890e7c4777b5655704346b432a85e6a430c81e9333317908dd548930
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are part of a link farm designed to manipulate search engine results. The document body, though heavily obfuscated, appears to be a lure related to sewing machine manuals. The presence of external URIs and the ML classifier's high confidence score indicate malicious intent, likely for SEO spam or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://golowaki.ru/wix?keyword=manual+maquina+coser+brother+lx-3125
    • http://erethiztzj.space/melusenanuxonhjda.pdf
    • https://cdn-cms.f-static.net/uploads/4413713/normal_5fe91c7dd977e.pdf
    • https://cdn-cms.f-static.net/uploads/4502563/normal_600aad2bbd96f.pdf
    • http://oneitshop.pro/19796898310fxwix.pdf
    • http://fogatevemawe.22web.org/ac_market_free_apk_android.pdf
    • http://alex-chekalev.com/50379666922tts51.pdf
    • https://static.s123-cdn-static.com/uploads/4481156/normal_5fcebf7088290.pdf
    • https://cdn-cms.f-static.net/uploads/4383678/normal_602d83b8e0feb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/d72a5355-2aba-4957-a12b-1a7086212fae/xalagevawekubixakuwi.pdf
    • https://b20aee1f-b1b7-4e4e-be5e-d884e4ece670.filesusr.com/ugd/10e3af_c1ec68b1a1e945e7867b61c925de2ada.pdf?index=true
    • http://vopuxoke.epizy.com/anemia_falciforme_e_sua_causa_genetica.pdf
    • https://d71fc03c-aea6-48f7-a990-8afffb22108d.filesusr.com/ugd/3de8a6_fcd67cd828d54b649651d590a3f12170.pdf?index=true
    • https://uploads.strikinglycdn.com/files/b6790c63-893c-4d3e-948d-25420f54b471/juxip.pdf
    • https://uploads.strikinglycdn.com/files/bb938aa3-8bcc-4d28-8583-b3ad034d1ada/video_brene_brown_power_of_vulnerability_audiobook.pdf
    • http://rajimorix.rf.gd/80885926672.pdf
    • http://gapogup.epizy.com/love_story_books_in_hindi_read_online.pdf
    • https://uploads.strikinglycdn.com/files/02ed764c-2686-48bb-9938-ca65e512b6f8/92237051742.pdf
    • https://uploads.strikinglycdn.com/files/cf07412e-38bc-4f18-b81b-53f979dc59be/how_did_system_of_alliances_contribute_to_world_war_i.pdf
    • https://6f81cef9-66a2-447d-9e1d-4c0427ef15c5.filesusr.com/ugd/4d935e_933fcdd514e7448897f3d43ff13a1d07.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcbb.bin
54e205d45190c2e972ff0ea6cf48b8ae57dfc1ba5c29a0ec5cf6d27e93fd6527		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDCBB 5880 bytes
font_01_sfnt_off0000f0b4.bin
ce5d3e0bd4de0f0cefa004454021141999f9102a8c7171e1951815ee63dfa033		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B4 11320 bytes

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