Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a7b81bf4b575c14…

MALICIOUS

PDF

76.2 KB Created: 2021-05-30 09:56:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: b63a9028ac836a5708adf1ef96af8034 SHA-1: 00b198713812c275f8b4a99cbb6f881af0eef75e SHA-256: 2a7b81bf4b575c1457a67f0be639813a761f54796b2c0c6f358a94cbc83fbe2f
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to manipulate search engine results. The embedded URL and the document body text, which includes search terms, indicate a phishing or scam attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://gimoguvi.ru/123?utm_term=unscramble+sentences+worksheets+pdf PDF link annotation
    • https://padazuvotoj.weebly.com/uploads/1/3/4/6/134687326/8696746.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367302/normal_5feaf6f00290d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495839/normal_6047a051e85ba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492897/normal_5ff846ef332fe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460066/normal_601ce8fcc0408.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406216/normal_5fd81972c44bc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387571/normal_606cf0878d341.pdfIn PDF document text
    • https://junenewawaxi.weebly.com/uploads/1/3/1/4/131407408/7dcdb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370077/normal_606adcd389af4.pdfIn PDF document text
    • https://vevenefokuje.weebly.com/uploads/1/3/0/7/130775565/642751.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446923/normal_6043033479676.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458856/normal_606c8fadb057c.pdfIn PDF document text
    • https://nexawukuvinu.weebly.com/uploads/1/3/4/5/134578226/7083657.pdfIn PDF document text
    • https://fufiwixafuwisu.weebly.com/uploads/1/3/4/7/134770326/7644066.pdfIn PDF document text
    • https://xavivovumerut.weebly.com/uploads/1/3/2/7/132741007/84bd7bbaa5cbc86.pdfIn PDF document text
    • https://rumejujosuzix.weebly.com/uploads/1/3/1/1/131164455/8ee716be8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379384/normal_5fd6ccf239271.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373241/normal_6035d2ef63dbd.pdfIn PDF document text
    • https://sixapinipuso.weebly.com/uploads/1/3/1/3/131384402/suxoleb.pdfIn PDF document text
    • https://lutijalejifepe.weebly.com/uploads/1/3/4/6/134649522/cf1147005db.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/ef04bf53-cf8b-4156-b62a-84ed26f8f389/how_to_control_your_mind_to_stop_thinking_about_someone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36f86c7f-837a-4eb9-a264-d56a805cd8fc/the_secret_life_of_walter_mitty_streaming_ita.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86c8e4de-796c-47b8-9057-707d34951f48/tour_guide_plugin_wordpress.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd6e5069-3c80-4da6-a7e9-7686a05e50eb/68280868657.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000def7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF7 5424 bytes
SHA-256: ccedf6b2e1070681b255f13b1a9755db1a87ecddd52a815c1aa39b2e0edbe524
font_01_sfnt_off0000f141.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF141 10560 bytes
SHA-256: f10249902c45f409b779ee84de799e1eaec9c5d972522ca106fe54cb80371f8c
font_02_sfnt_off0001152a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1152A 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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