Malicious PDF — malware analysis report

Static analysis result for SHA-256 f77cf915622faa9b…

MALICIOUS

PDF

78.7 KB Created: 2021-03-29 05:01:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 2ee03a8ed71b9990532e02561e848359 SHA-1: b1ce0b70ae5fe6b8c512f08d029995ef668373bd SHA-256: f77cf915622faa9bd3808d9bb915d4d5bcb7474622e25285d61f1d4e4cfd423b
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 0.9997

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://zajinet.ru/award?keyword=air+on+a+g+string+piano+pdf PDF link annotation
    • https://susakatevasek.weebly.com/uploads/1/3/4/8/134871092/wawatib.pdfIn PDF document text
    • https://cdn.sqhk.co/dexizajifu/2idniaj/56497593766.pdfIn PDF document text
    • https://tatedamemod.weebly.com/uploads/1/3/0/7/130739791/zuzume.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366964/normal_60084fac54eee.pdfIn PDF document text
    • https://cdn.sqhk.co/dudugetogi/lLmJjac/soluwisoj.pdfIn PDF document text
    • https://cdn.sqhk.co/tagubutapa/SjeJe1W/gattu_battu_music_video.pdfIn PDF document text
    • https://cdn.sqhk.co/kimazibo/envZ64U/simplerockets_2_free_ios.pdfIn PDF document text
    • https://cdn.sqhk.co/dofexoxev/ieSV44s/recarga_amigo_entretenimiento_telcel_que_es.pdfIn PDF document text
    • https://cdn.sqhk.co/gutemokerezo/iKIiiie/71721884407.pdfIn PDF document text
    • https://cdn.sqhk.co/tagodepa/jchjhru/sitting_room_furniture_for_sale_wexford.pdfIn PDF document text
    • https://mewatejo.weebly.com/uploads/1/3/5/3/135322937/fobipetuzelimizi.pdfIn PDF document text
    • https://cdn.sqhk.co/tefegegesuxe/JibehbU/baby_shark_trap_remix_sun-_j_choreography_youtube.pdfIn PDF document text
    • http://gelupulofevabek.medianewsonline.com/5830717520.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417656/normal_6054f6f1b8c4b.pdfIn PDF document text
    • https://tajixuxax.weebly.com/uploads/1/3/4/7/134751877/tewubokekizuwe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bitujiduruv.myartsonline.com/calculus_essentials_for_dummies.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/145f3ab1-9fc8-4d34-a3ec-39538f822f26/sharp_portable_air_conditioner_replacement_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68e782d7-782b-4048-a3f3-1520e47b4e9b/nespresso_expert_milk_manual_dansk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5265368f-446c-4fe9-a208-29b10ba02243/how_to_find_joint_in_matlab.pdfIn PDF document text
    • http://rogomore.myartsonline.com/61563963283.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37679000-e006-4c62-8341-2acc5a68a5e2/fluke_t5-1000_service_manual.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_off0000f54b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF54B 5164 bytes
SHA-256: 35b549ed0b57859ea0662d1d3c20cd7d4e474812fd4ac8f2c3e812b99153844e
font_01_sfnt_off000106f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106F0 12392 bytes
SHA-256: 2537bbb02454184302ce7c24e65c1aac10c8f468443efcb524f9dca760c9cd52

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