Malicious PDF — malware analysis report

Static analysis result for SHA-256 71edda0e50827fa0…

MALICIOUS

PDF

84.8 KB Created: 2021-03-14 15:59:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 2a3b1ca8ef44044552180b97dff8924d SHA-1: 2563a0ae834655fef6b78e2961ee81b2bdc3d2dc SHA-256: 71edda0e50827fa0651647ac29efd1776f7a655a8b943ac91b2ed8e6f2376371
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which are hosted on disposable domains, indicating a link farm or phishing operation. The document body, though partially corrupted, suggests a lure related to social interaction. The presence of ClamAV detection and ML flagging further supports its malicious nature, likely serving as a dropper or redirector to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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.
  • 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://nipisod.ru/strik?utm_term=how+to+answer+who+are+you+question+from+a+girl PDF link annotation
    • https://fenejetamop.weebly.com/uploads/1/3/4/6/134697978/lotuviw.pdfIn PDF document text
    • https://bobujiwa.weebly.com/uploads/1/3/1/0/131070874/telagakubopemowe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413225/normal_5fd2ae12b8782.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366324/normal_5fccb95911e69.pdfIn PDF document text
    • http://sigisuzuk.getenjoyment.net/84767573288.pdfIn PDF document text
    • http://siwosupegejolop.medianewsonline.com/toxisodujopisikemofev.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497395/normal_5feaf05d53bb2.pdfIn PDF document text
    • https://zuxivojeduzudog.weebly.com/uploads/1/3/1/3/131381782/suxoxititelodif.pdfIn PDF document text
    • http://xorimomupajo.scienceontheweb.net/whirlpool_whes30_water_softener_reviews.pdfIn PDF document text
    • https://solakozejifu.weebly.com/uploads/1/3/5/3/135347449/golexupefinomotodi.pdfIn PDF document text
    • https://zawasofolebu.weebly.com/uploads/1/3/4/9/134902788/489361.pdfIn PDF document text
    • http://madoxorijegobe.sportsontheweb.net/the_crystal_bible_judy_hall_download.pdfIn PDF document text
    • http://rikafitamedad.medianewsonline.com/gurifedonowuwufazi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412897/normal_5fe15399d95e4.pdfIn PDF document text
    • http://kadanijojabuf.mywebcommunity.org/bhagavad_gita_18_chapter_in_kannada.pdfIn PDF document text
    • http://gatowixipeba.mywebcommunity.org/do_you_capitalize_graduate_student.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/79bd82d7-4779-44ba-8eeb-17591d1294ef/wurasiv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ba62461-f73b-4bd4-8bc7-0db2e7deef7a/61888288256.pdfIn PDF document text
    • http://wadoromutisagar.myartsonline.com/75362936748.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7bed288a-f45f-4d5b-9690-2f04b52c022c/16119483447.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36a5a91a-02af-4468-bee9-6dc453cd387c/23047586195.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/713502f9-abcc-4440-a6b9-1164e0c9876d/vebejojirowugafo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11079715-ca87-42dd-b239-743adc424d76/5290696775.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4791c866-0c7d-4490-b5ef-ac8c59fbea11/stickman_battle_super_shadow_unlimited_money.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2c64494-5cf8-454b-9ee0-2e7e830cdf10/sunaxol.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E4 5460 bytes
SHA-256: f053c855ebf7dfdae880f63a818f0b10ed76de8e6c31b20d0694aa3786261589
font_01_sfnt_off00010863.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10863 11212 bytes
SHA-256: 88ad807092d2249c77636c6b9e2f6895ab119311b496f47d0aa69cadd90e76da
font_02_sfnt_off00012e3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E3D 16060 bytes
SHA-256: a1e2968ca8c7638dd4bef022e186f3fea2b098bc52bbc7b81535a6634822059c