Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d35f56c521e6e8e…

MALICIOUS

PDF

73.7 KB Created: 2021-04-04 04:43:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: a72b876f3de5f542939bb1e1415ea3ab SHA-1: 2a1a361a7523f3d69b0f758e253c503794530fc0 SHA-256: 1d35f56c521e6e8e0ba9c0bc460ee167cf67d336908e6892e00eafeadaaf0142
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 0.9999

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://xezojetit.ru/strik?utm_term=chuwi+hi8+recovery+mode PDF link annotation
    • https://cdn.sqhk.co/sadebupunen/hh6shiM/69843528631.pdfIn PDF document text
    • https://cdn.sqhk.co/deguxigu/f0ihhg1/fashion_croquis_templates_front_and_back.pdfIn PDF document text
    • https://latezuletarok.weebly.com/uploads/1/3/5/2/135298634/1582730.pdfIn PDF document text
    • https://tokuniti.weebly.com/uploads/1/3/4/3/134331772/mefupelutadupuvewo.pdfIn PDF document text
    • https://cdn.sqhk.co/diwewiduvaz/b8qjbgj/okhttp_headers_android.pdfIn PDF document text
    • https://cdn.sqhk.co/nodezaneripe/s7IpMii/55034080149.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://85ed388a-52e0-4e79-9737-9d4b769dda71.filesusr.com/ugd/bb10c5_228c507cd494487297630ce831bd70a9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jukezeluf/abcd_film_video_songs_free.pdfIn PDF document text
    • https://s3.amazonaws.com/fumiposamisur/32089770518.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a16287e4-50fe-407f-aa80-8bd2fd43e822/ilo_tv_codes_for_ge_universal_remote.pdfIn PDF document text
    • https://s3.amazonaws.com/vukusa/73109596893.pdfIn PDF document text
    • https://46ebecaa-9490-439b-bba6-ee77f1a6ca93.filesusr.com/ugd/cee8a1_5feef81f9a594e52a4adce9d197dcd73.pdf?index=trueIn PDF document text
    • https://86a9da1b-0b57-4b35-a77a-523886b904cd.filesusr.com/ugd/0d9a50_728b116c652740338e1e0c65a7b83e04.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gopuze/pulse_amplitude_modulation_using_555_timer.pdfIn PDF document text
    • https://aa514bbb-a96e-4bc9-8ff3-0ca2edd1104f.filesusr.com/ugd/3fc21f_da794333bac54111996a5490ac1c0b7d.pdf?index=trueIn PDF document text
    • https://d78d2789-9aef-4bfd-88be-9093bec910ef.filesusr.com/ugd/87a178_e3ecea7056ba498ab712b213dda93ba3.pdf?index=trueIn PDF document text
    • https://c84ffda1-e72a-45fa-8ce8-a771970cf326.filesusr.com/ugd/9fd656_57f9126e2c3b41a587d404c35612e1b5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8b69ccf-1897-46db-a5b6-792c73dfc3c6/the_militia_act_of_1792.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_off0000e3a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A6 5112 bytes
SHA-256: 6306f5bcc4790e2dad100a2bd5f270b18d6c41a1b43f7df574d08ab5350a776c
font_01_sfnt_off0000f4fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4FB 10796 bytes
SHA-256: ab43dc72e3ee964bac64b9fb37b809d6c6400ab3ec59f0a4eefec83c119bf66c

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