Malicious PDF — malware analysis report

Static analysis result for SHA-256 41d75323076107a4…

MALICIOUS

PDF

72.5 KB Created: 2021-04-02 04:35:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 3a4db4df31ba061263ed3f155756d0b3 SHA-1: 841032a6dd326a009e8a92c8f50a283c120c35cb SHA-256: 41d75323076107a4a51fd14fdb39d5e227cc1eab6ccf4fb318cfd7f2f1970fd1
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by both ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic further support this, indicating the document's primary purpose is to redirect users to potentially harmful external 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://jacksth.ru/aws?utm_term=arctic+king+3+in+1+portable+air+conditioner+reviews PDF link annotation
    • https://wuwiragirek.weebly.com/uploads/1/3/0/8/130874366/noridazexixotifob.pdfIn PDF document text
    • http://poboxabirukus.iblogger.org/bajovujutifoguvikux.pdfIn PDF document text
    • http://jatepot.22web.org/tixalekotifesomunav.pdfIn PDF document text
    • http://simopuvoramawu.mywebcommunity.org/air_fryer_recipes_healthy_dessert.pdfIn PDF document text
    • https://faloxumotib.weebly.com/uploads/1/3/4/6/134646793/luluv-zisubepe-baviboxugunoxa-kepagiwojili.pdfIn PDF document text
    • http://fukerijinexin.mygamesonline.org/14209883244.pdfIn PDF document text
    • http://kipokefurur.mygamesonline.org/gixemoz.pdfIn PDF document text
    • https://pewarefat.weebly.com/uploads/1/3/4/3/134361746/1758318.pdfIn PDF document text
    • http://zarumesa.mypressonline.com/tubuxusebinazumopep.pdfIn PDF document text
    • https://cdn.sqhk.co/ronelejibir/Onfhchi/nevuzitaluzuvejemagesas.pdfIn PDF document text
    • https://cdn.sqhk.co/nisugavu/idigiaB/miroclash_coc_download_ios.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/4c40d660-4fe2-4b4a-8a22-c41e22f8f0c2/what_is_hypothesis_in_social_research.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46c4c476-6969-4caf-bbb5-ecc3ae39ba10/23065621656.pdfIn PDF document text
    • http://gubawakelu.onlinewebshop.net/64642638502.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/524bea96-b27a-4486-8fae-9f1e8cd69ebb/69912731142.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/429a80c7-4285-40ec-9aaa-5421839d9dcc/fossil_q_explorist_gen_5_smartwatch.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4890c30c-2477-428e-ac6f-f4cbd655fece/all_my_friends_are_dead_netflix_uk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7fed7c0-84c8-40d9-bd62-cae2ede29658/kitibixelukilupedax.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_off0000dd75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD75 5804 bytes
SHA-256: 7e0f3d28b218449ac35b4e4d257dd8b0f3a3fe031f4297922463f96a0db75443
font_01_sfnt_off0000f159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF159 10384 bytes
SHA-256: bc2c5ebca3c880a5d03b922ec5a817f9d185153804e417557b3828fe36913b0a

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