Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b68b357d5a19f40…

MALICIOUS

PDF

76.4 KB Created: 2021-03-27 11:31:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 035c704d11bc19f7bc3d718c673faf07 SHA-1: 5e6edb240cf451db01576f653f034857b9a26ff3 SHA-256: 7b68b357d5a19f40ee78271885d271f5cc0cde8d1b45f0af78111eeb6c398374
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://bologen.ru/strik?utm_term=project-based+learning+in+the+math+classroom PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4485010/normal_603d8e6b8a2d6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368970/normal_5fdc1d29bd50a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374843/normal_5ff3b255a4fc6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446914/normal_5feeb5b4a70a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425238/normal_60550a8370109.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418567/normal_5fe66b5af257b.pdfIn PDF document text
    • https://cdn.sqhk.co/minofavazu/hbUTayw/88912065675.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496853/normal_5fea19a0b82e7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412592/normal_6023b7ed7ac43.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410027/normal_5fe4b66c45373.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445104/normal_6020a51e40cc0.pdfIn PDF document text
    • https://cdn.sqhk.co/vumusokutil/hbFchej/bounce_classic_game_cheat_codes_for_android.pdfIn PDF document text
    • https://cdn.sqhk.co/dukizukijire/NRhhO4X/fezavonub.pdfIn PDF document text
    • https://cdn.sqhk.co/nogorodizet/Siugigh/8037114744.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kedisijusa.onlinewebshop.net/78051342574.pdfIn PDF document text
    • http://kufekisawisewo.onlinewebshop.net/36365489625.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/adddac12-ea45-45d9-ab52-2f1735493052/fepuxotitawowukudefoje.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fbc7f314-4f19-41e6-bda5-3c654a4f8bd7/ge_4_device_universal_remote_control_silver_code_list.pdfIn PDF document text
    • http://sitafefisoju.atwebpages.com/how_cognitive_behavioural_therapy_works.pdfIn PDF document text
    • https://8137cd1e-393d-4948-8193-eca935452849.filesusr.com/ugd/756799_d207956caaee4b739de1a196071d9626.pdf?index=trueIn PDF document text
    • http://fegoluvarelewum.myartsonline.com/tattoo_aftercare_form.pdfIn PDF document text
    • https://3f3b26af-a357-4ab7-b723-baa2d0f6bb2b.filesusr.com/ugd/5d6e2e_fcdfc70afffb47dfa551063196af6a77.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3ea4c17-676c-4468-ae20-523edc7361df/v_for_vendetta_movie.pdfIn PDF document text
    • https://154530d8-637b-49d0-b90a-43bf07a176fb.filesusr.com/ugd/59359a_63c0fdd82832419ba693bb8454a623e4.pdf?index=trueIn 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_off0000eab7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB7 5604 bytes
SHA-256: 54eaa65e76b8adb695bb685052e83dfc1066846a3c99aac40c7a15a737ada2d5
font_01_sfnt_off0000fd96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD96 11312 bytes
SHA-256: fcf4d8100f10c45cc5ced96f9a32f9ba2377848af93a355f6b58fa5a73dace0e

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