Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d579047ca2dece4…

MALICIOUS

PDF

188.7 KB Created: 2021-05-22 10:09:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 1cc74170f0d7f2d6d13949dd5ad2301e SHA-1: d83504f05908622f5227d9c7a70d023b1803178b SHA-256: 5d579047ca2dece4366f69bf1b8ef9c7d57ae543ea6cc0de0db45d4d70cd31e2
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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/strik?utm_term=what+are+the+general+characteristics+of+fungi In PDF document text
    • https://xamubamujizej.weebly.com/uploads/1/3/1/4/131483378/xesopatupojiwow_pitosigitenen_fofezomizagazew.pdfIn PDF document text
    • https://pawawejovotete.weebly.com/uploads/1/3/2/8/132814611/7ab1d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413226/normal_5fea47310c1f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411481/normal_5fdc0ca710261.pdfIn PDF document text
    • https://wimiberurazem.weebly.com/uploads/1/3/4/3/134351881/048d4928.pdfIn PDF document text
    • https://gijejutet.weebly.com/uploads/1/3/5/9/135974865/zazowimo.pdfIn PDF document text
    • https://zabapekiji.weebly.com/uploads/1/3/4/4/134470890/3678dfb7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370064/normal_5fdfb4a6db4e2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366665/normal_6001a82776d47.pdfIn PDF document text
    • https://xabizukilitexe.weebly.com/uploads/1/3/4/3/134335342/7052900.pdfIn PDF document text
    • https://muxuredoli.weebly.com/uploads/1/3/1/3/131380086/tapamigi.pdfIn PDF document text
    • https://lekolusogi.weebly.com/uploads/1/3/4/3/134365603/vibetabinumij-rurugojolo.pdfIn PDF document text
    • https://jizetexosobuwek.weebly.com/uploads/1/3/0/7/130740437/zoboraruvoro-bekegeduweg.pdfIn PDF document text
    • https://mebopezik.weebly.com/uploads/1/3/4/7/134772208/jagun-zodorebosazej-fovujeliba-valapatixa.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/dda5bb40-690d-4ade-b3fd-97236fbaf1d4/10353197873.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e161de4-2cb8-47f4-81ac-7a32ae8443d4/how_to_set_timezone_on_lacrosse_atomic_clock.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47d38b86-e8b8-4e3b-a237-d21b9b1f6311/13550168203.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6496d3cc-4443-4150-91d6-b266802a1cb2/favimosisatewurevazakudu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d4c85de-7d58-4b0d-bdbe-a6dc4b71f3ac/venn_diagram_questions_and_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17e7fbb2-b5f0-47a4-9c33-6f3960636759/13439643728.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65cd9a31-fb94-461b-9691-d80795fc354f/comprhension_crite_anglais_b1.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0002880d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2880D 5036 bytes
SHA-256: 99d0996bb129bd5dca93562ca8d75545adcd4d0ad5632380b71fec8d11720523
font_01_sfnt_off00029935.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x29935 11960 bytes
SHA-256: 1bea0f28d8361121a9ec62403a816ca163f5decb2264bc2c834c0ef4b5a7cae2
font_02_sfnt_off0002bedf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2BEDF 16204 bytes
SHA-256: e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15
font_03_sfnt_off0002d40d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D40D 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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