Malicious PDF — malware analysis report

Static analysis result for SHA-256 577f24aa53271c35…

MALICIOUS

PDF

72.6 KB Created: 2021-04-06 22:18:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: e48951d6f8ce19b5a08a730f5fcbf42d SHA-1: cffea86d286f3e1f622ae4a469a4b47b7c4f59a1 SHA-256: 577f24aa53271c355d7f63c6b1824f81330e8f5657f615ab5a44999ce41c1ccf
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and the ML classifier strongly indicate malicious intent. The document body, though heavily obfuscated, appears to contain keywords related to technical manuals, likely serving as a lure to disguise the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/award?keyword=apc+smart+ups+750+service+manual+pdf In PDF document text
    • http://shopeuro.pro/49025749619asazy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369632/normal_6036124eb0888.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459054/normal_601b9965a4be3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475716/normal_602f006eb6e78.pdfIn PDF document text
    • http://sumigemag.mywebcommunity.org/mivobe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408485/normal_6052b85f6f739.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388614/normal_5fd944b2a7a68.pdfIn PDF document text
    • http://silkhfig.bid/difuwadabipisiwo25dje.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://keporumutiwem.epizy.com/sheet_gasket_material_suppliers.pdfIn PDF document text
    • https://9a4203bb-6ff2-4ef1-9c63-3f113f84a884.filesusr.com/ugd/ea9bdf_82079539d57e4c738291db453ed02317.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a0a91be-25b3-437c-abae-6e787a7530c1/jokopolimilawubotowusabi.pdfIn PDF document text
    • https://6363ce23-9394-4102-a476-7be320345719.filesusr.com/ugd/7c41c1_b97e23d8738f43db9878a05add3cab43.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/25dc5e08-4e6b-4121-ac44-ac794d67be75/noxalipu.pdfIn PDF document text
    • https://c1f973cf-d719-4acb-8f9e-cd83ae4fb94d.filesusr.com/ugd/057766_08a94404600d4bbc968c7ec043561818.pdf?index=trueIn PDF document text
    • http://tosipasakuvil.myartsonline.com/understanding_business_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27497582-3bf2-465c-844c-5e5e3e5139d9/a_suitable_boy_on_netflix_usa.pdfIn PDF document text
    • http://mowobamalopun.epizy.com/retirement_resignation_letter_template_australia.pdfIn PDF document text
    • http://sosibozipez.rf.gd/zegivesugus.pdfIn PDF document text
    • https://e0d0d77b-4c00-4265-bc22-f0cc5cf11ada.filesusr.com/ugd/957eb4_7bf2157d390849a3bb79e6377f03f9cb.pdf?index=trueIn PDF document text
    • http://jizotitumeviw.rf.gd/bilufugow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad6f1f7e-d6a7-4192-94f2-19d2c2c8ad8a/oz_season_1_episode_1_free_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d39b028-bccd-4769-836c-34f301addef7/71364053847.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_off0000da36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA36 5696 bytes
SHA-256: dda552122f2f9a176c610665d396844ab61f145c1838093f4eb4256ba9e7d666
font_01_sfnt_off0000ed91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED91 11072 bytes
SHA-256: f25f669a6a3ccad294f69352619e59fabf14272f263ac4c13fc1070499f21c68

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