Malicious PDF — malware analysis report

Static analysis result for SHA-256 39539a0c62d6a6fa…

MALICIOUS

PDF

81.1 KB Created: 2021-05-20 03:48:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: b4045da53fe976311dceef910d018a92 SHA-1: 86c38c23de007cfe193972f6977dbf9d61f8be23 SHA-256: 39539a0c62d6a6fac9138f2744bd4f8eee70ef5f987ba2294fd9ef8b1163fa40
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm used for SEO manipulation or phishing. The primary external URI, 'https://dugedepap.ru/strik?utm_term=html+coding+book+pdf+free', is likely the intended destination for users, potentially leading to further malicious content or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://dugedepap.ru/strik?utm_term=html+coding+book+pdf+free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4374021/normal_6035808a3c57b.pdfIn PDF document text
    • https://paboludozov.weebly.com/uploads/1/3/4/3/134333588/361371.pdfIn PDF document text
    • https://todilotifobaw.weebly.com/uploads/1/3/2/7/132712516/fekuri.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459478/normal_600e6d07afdee.pdfIn PDF document text
    • https://nanavefog.weebly.com/uploads/1/3/0/7/130775134/dcbc7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375194/normal_605a4c11d3296.pdfIn PDF document text
    • https://xoxomedeze.weebly.com/uploads/1/3/5/3/135308121/nofidabazawera-seraveso-jifufoda.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377410/normal_605bb1efda015.pdfIn PDF document text
    • https://xuwosanilenerev.weebly.com/uploads/1/3/4/9/134900173/wuwoxomo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480149/normal_5fee4f9583cea.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/714cd760-65ba-490a-a485-21759de546fa/char_broil_big_easy_turkey_rub_recipe.pdfIn PDF document text
    • https://s3.amazonaws.com/zexozavo/bodybuilder_ki_photo.pdfIn PDF document text
    • https://s3.amazonaws.com/feliso/3092785477.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eca1393e-e9a3-44f5-9e95-92aa049bd98c/purpose_of_writing_an_essay.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/267e3387-f852-46f6-8493-2c257eacff1e/64199960449.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23d307b1-acf1-4d59-91c6-593fc08c9a37/60684894583.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82ba9933-9446-4627-8e47-fc1086ddbc75/kekudokid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8479c598-815c-429f-8a16-d4fe5d300db6/luzesu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97de0c70-541e-4e02-8e58-f3ce4e4a973d/58715523073.pdfIn PDF document text
    • https://s3.amazonaws.com/vovopafubipu/baofeng_uv-5re_plus_programming.pdfIn PDF document text
    • https://s3.amazonaws.com/mejados/soap_under_sheets_for_restless_legs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/615934ce-0507-4931-b36f-d52282d4a803/mudipuzamakifinozirodaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e23a412c-05b0-4285-a57d-9f72ab34e315/xogimevapebevifotezope.pdfIn PDF document text
    • https://s3.amazonaws.com/zikeko/65714239130.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36adc2ba-078d-4623-a520-9f9fbf00fe99/how_to_wear_mask_with_pleats.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_off0000e22d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE22D 5252 bytes
SHA-256: 79e9b49e27b81f20a9e1a8fb95c4aec186ff17202ff3abfc10ac87b9e5e8d54d
font_01_sfnt_off0000f3f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F7 25636 bytes
SHA-256: a80e7d450b6d0535c7ff8978c1e9671f5d1800a444082c604990ea7b434a90b5

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