Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c01ba4e1a8c1ee3…

MALICIOUS

PDF

76.1 KB Created: 2021-03-15 23:03:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 1aa684ee9c7125587de6adc1cd75474e SHA-1: 2aa67ca634db3be224f3d25b052b430fa4a1d7a8 SHA-256: 1c01ba4e1a8c1ee3f9e57695f121d3deda2c31a0b0e2796fb25a573ac202d3dc
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The embedded URLs and the PDF's structure are consistent with a spearphishing attachment designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://mezovuduw.ru/wix?keyword=nucleic+acids+worksheet+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4474759/normal_604ad07b6cc0a.pdfIn PDF document text
    • https://cdn.sqhk.co/xivovido/ifgdiaV/vagoxepe.pdfIn PDF document text
    • https://mizavuzozubex.weebly.com/uploads/1/3/4/7/134730625/xikululalimekew-wepebe-bumakifa-jiramewi.pdfIn PDF document text
    • https://jabenawonidibe.weebly.com/uploads/1/3/5/3/135385032/juneli.pdfIn PDF document text
    • https://cdn.sqhk.co/torujazelome/ijUtuRB/29609315852.pdfIn PDF document text
    • https://cdn.sqhk.co/rewazexi/QuUgfFR/origami_gift_boxes_step_by_step.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373281/normal_5feb28469b3a9.pdfIn PDF document text
    • https://jasebezaf.weebly.com/uploads/1/3/4/6/134630561/dibenasazikixivena.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408981/normal_601554d26f425.pdfIn PDF document text
    • https://vimedapajabapi.weebly.com/uploads/1/3/5/3/135309909/9dfc2f7f69b.pdfIn PDF document text
    • https://cdn.sqhk.co/definuseju/if6gdid/58116284286.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413467/normal_5fed2937970dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452381/normal_601ca82c8f1dc.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/c77b9152-2e0d-4557-a729-3891e63d5706/55420370820.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7278b2ba-2cc1-490c-8931-77697e6609a8/julazugejerurolodegoxo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65ab8d66-3198-4fd7-9cd0-66d539de2f4f/happy_birthday_letter_to_a_long_lost_friend.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d054caa6-a1a5-47e8-85da-4638bdc30abb/74448159746.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e443d4db-b7e9-4ebd-a885-69c0adc79793/hp_laserjet_p1102_user_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b6c9887-5855-47ab-be50-7d9a5c8bb935/her_tears_were_my_light_fanart.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_off0000ed44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED44 5152 bytes
SHA-256: 86f7cd548ec23859911b55e5939e6f018b935ac2f74007cf370e92d5cbc57e2c
font_01_sfnt_off0000feda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEDA 10456 bytes
SHA-256: 08a5876db20fe12dfe879fa5caca79095438e7440ebbd1f2148d38b2f565afb3

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