Malicious PDF — malware analysis report

Static analysis result for SHA-256 a477622f2ee7363c…

MALICIOUS

PDF

77.6 KB Created: 2021-02-24 12:03:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b78f2404849fda3ba72f0cfd3eba1b5e SHA-1: 64c22417e985dbf6303ded56ad5d8e2603d7d8a8 SHA-256: a477622f2ee7363cd4ae8718ab7ed55f54e04f4e8f66bb5a76471801808783ac
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 0.9998

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://leonvi.ru/strik?utm_term=epson+wf+2530+installation+wifi PDF link annotation
    • http://fisifur.iblogger.org/please_be_informed.pdfIn PDF document text
    • http://copyrightsafetyhelps.com/explorelearning_gizmos_answer_key3sqvs.pdfIn PDF document text
    • http://interplast.ru/dwop_notice_to_quitzbgzr.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481522/normal_5ff60d24a62e9.pdfIn PDF document text
    • http://tophomework.space/hunter_douglas_motorized_blinds_replacing_batteries3oe75.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369769/normal_601bb9129eba6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416669/normal_5fc9454d73392.pdfIn PDF document text
    • http://teagreen.space/932051440556t6kv.pdfIn PDF document text
    • https://cdn.sqhk.co/zopinulepa/abZhj63/deditalolidirapi.pdfIn PDF document text
    • https://cdn.sqhk.co/rivogigaweb/6TDWXpL/voxixub.pdfIn PDF document text
    • http://ragukir.iblogger.org/friend_zone_thai_movie_sub_indo.pdfIn PDF document text
    • http://fabulouss.space/windows_7_activate_key_freerbr0g.pdfIn PDF document text
    • http://vedice.ru/simple_past_affirmative_negative_interrogative_formsui1e4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://diwigivexuvobe.epizy.com/19786626150.pdfIn PDF document text
    • http://godemesefiw.epizy.com/jutuvajokanuvudep.pdfIn PDF document text
    • http://luvibiw.epizy.com/ios_13_beta_3_iphone_7.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
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e08d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE08D 5412 bytes
SHA-256: b6f828f190e294bf19417dcc5e0759f6e0230cd296d4465c4353a29a4feb20ad
font_01_sfnt_off0000f31a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF31A 6352 bytes
SHA-256: 53d75380088c0522320e18b18f07e289a13c7ddd03427ab6abbb274966e87051
font_02_sfnt_off000103c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C6 10744 bytes
SHA-256: 0cbafcc1714ab9bbffd852eb823b1245acf20b8a8e3469085b71af5977389eab

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