Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb48c529cbecf894…

MALICIOUS

PDF

83.6 KB Created: 2021-04-02 14:42:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 3657f3a2781160e0eecb5cd7f9957815 SHA-1: 9645c9419f433e387280e2b2cc96334f8e388b9d SHA-256: bb48c529cbecf894083ddb460310bae2457bac628d868fe58f16e05aceed95c7
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 0.9996

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
  • 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.
  • 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://leonvi.ru/strik?utm_term=asp+net+core+mvc+modal+popup+partial+view PDF link annotation
    • https://guxojifupu.weebly.com/uploads/1/3/1/4/131438233/541091.pdfIn PDF document text
    • https://cdn.sqhk.co/rasadenibe/jcAOjfA/6281080273.pdfIn PDF document text
    • https://cdn.sqhk.co/nevupediwix/ihhhaJm/87190340766.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450354/normal_604151716089a.pdfIn PDF document text
    • https://fufukarebalomok.weebly.com/uploads/1/3/4/3/134352968/nititebogisupuva.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478927/normal_5fefcd4d27fd9.pdfIn PDF document text
    • https://pegemogavabupaz.weebly.com/uploads/1/3/4/3/134310843/2974811.pdfIn PDF document text
    • https://mufewikusa.weebly.com/uploads/1/3/4/0/134042586/tuwuwo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/62a3fc5f-7b31-4d61-90db-a14ab24c2e42/40_rules_of_love_book_amazon.pdfIn PDF document text
    • https://29aa9d28-cc9d-45fc-8d86-3718b5881c84.filesusr.com/ugd/74c34a_a282edd5dd6d46d39437c453dfacaa1a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fdf84974-8b3e-4244-bb5a-5ae076b0489b/elective_merit_badges_for_eagle.pdfIn PDF document text
    • https://2eeb51df-07ba-4372-80d9-1ef4646fc7f7.filesusr.com/ugd/6af210_20b85cbc1f024a2f80faff091877faa3.pdf?index=trueIn PDF document text
    • https://6f672a44-e16c-4921-a0f1-e3781c0647c5.filesusr.com/ugd/bda22a_944ce10d04014718a442b98d83b18fb1.pdf?index=trueIn PDF document text
    • https://e82ff0bd-cb1a-4782-8b92-0a0fb7657660.filesusr.com/ugd/d17951_c0833e43a6484611bcaeb3f2fa463ab9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a89de449-d5e6-4d63-b67d-48def7fe3f0f/fivumadekupade.pdfIn PDF document text
    • https://d1159ab4-cbf5-42eb-897b-83a5e94cd7da.filesusr.com/ugd/536122_54c730cf6410434f8c659efa7b3bac79.pdf?index=trueIn PDF document text
    • https://d190c387-1498-4382-a59e-98d1a0a9794c.filesusr.com/ugd/a91264_22c188be2a58417888994489b591f0d1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9ba787f-906a-4d65-8762-e88e099dedc6/sharp_aquos_manual_reset.pdfIn PDF document text
    • https://b70645e9-42d7-44c6-80f2-f165c8819e8d.filesusr.com/ugd/3f1130_b6e17a50dbf644779bf5b64a8200cba0.pdf?index=trueIn PDF document text
    • https://a6132035-7465-4fe4-be4e-2faa96c22dab.filesusr.com/ugd/cf950b_12e92c5ff9d0459a821d454e0552bf62.pdf?index=trueIn PDF document text
    • https://70645266-f316-485f-8907-c893ecb8e977.filesusr.com/ugd/12745a_073d5e2d1a3a4b60a66aabee4b6a256d.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fad5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD5 5240 bytes
SHA-256: 11dcc45b89d9ede3f65ee9db62c50ce950046ec32a465e6e3058eceed82d0c8c
font_01_sfnt_off00010c95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C95 11100 bytes
SHA-256: caac2071d28138eecbd26d6a14e1abaee00747adde8f62c10ccb76d7dabfbd6d
font_02_sfnt_off00013269.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13269 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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