Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b63834ef61f0adb…

MALICIOUS

PDF

81.9 KB Created: 2021-03-20 17:56:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 778bb2211439962046c6521cc9a6436b SHA-1: 56b3c64ff1bb0311ce06f5f066a68f62f8e8323c SHA-256: 5b63834ef61f0adbf60424d8990be3be2e36a02c386d13904b89a028a9d2ec38
206 Risk Score

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. It uses a callback-phone (TOAD) lure. 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 7

  • 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 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://pelibifir.ru/strik?utm_term=is+newsmax+available+on+spectrum PDF link annotation
    • http://gimatadokij.mygamesonline.org/12680484683.pdfIn PDF document text
    • https://gimelasu.weebly.com/uploads/1/3/4/5/134513778/e63cb2169b13.pdfIn PDF document text
    • http://italystore.pro/naruto_shippuden_ultimate_ninja_impact_apk_download_for_android4p8ql.pdfIn PDF document text
    • http://zokidinodajives.getenjoyment.net/the_aleph_in_the_mirror_page_37.pdfIn PDF document text
    • https://kebolegenadudus.weebly.com/uploads/1/3/1/4/131454121/vakabudi.pdfIn PDF document text
    • http://evilcheats.fun/jimolaritumerlpyyc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499629/normal_604cc8b14c423.pdfIn PDF document text
    • http://instapriz24.online/dc_food_establishment_inspection_reportyj292.pdfIn PDF document text
    • https://lobubanir.weebly.com/uploads/1/3/2/8/132814664/9296495.pdfIn PDF document text
    • http://wulutapebime.getenjoyment.net/ratisewivikewupujarojugir.pdfIn PDF document text
    • http://znohist.site/variance_of_binomial_distributionlyde3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469633/normal_603581477b0cb.pdfIn PDF document text
    • https://sokudepan.weebly.com/uploads/1/3/1/8/131871622/dusesij-govejesekafab.pdfIn PDF document text
    • http://iranianvc.com/sefirovap4cv1.pdfIn PDF document text
    • https://xasuzetevoke.weebly.com/uploads/1/3/2/6/132681443/pomazujuvag.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/0bc82b20-a4fb-4972-a678-ab7ae3849cd3/the_road_to_el_dorado_miguel_x_reader.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e841d169-5c3e-4dc1-8828-6b2e984a91fa/how_to_fix_leaking_insinkerator_hot_water_dispenser.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11259d5a-23ab-41ec-802f-7501c55412d9/bissell_pet_hair_eraser_upright_vacuum_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e583a232-cbde-48c6-b1f7-59ba78a0125a/74779525130.pdfIn PDF document text
    • http://sijadogif.atwebpages.com/86567326304.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/315376b1-6162-4834-bbb4-603b54f81964/how_to_write_a_simple_book_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e95d7136-5ebf-4155-aa55-215c099c6a4a/why_marriages_succeed_or_fail_book_review.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_off0001007c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1007C 5376 bytes
SHA-256: 6ac7a49cefa48118b7e9347b74abf5f3b1343dcccaae86c5a5165be19795a965
font_01_sfnt_off000112bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112BC 11632 bytes
SHA-256: 319462f5ac41e28e8bed4d988469acbfd1604bd9df93b05b7924bf5bb371638b