Malicious PDF — malware analysis report

Static analysis result for SHA-256 5835b3274d17c947…

MALICIOUS

PDF

86.3 KB Created: 2021-03-12 11:52:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: e0098a6d00765a56ce17a45c3ef10d12 SHA-1: 14b74ca033b1a48959ed7337e11b58bb27d088b2 SHA-256: 5835b3274d17c9474d8ea600ab2f45046488bb159db65398aa77f4c952dfd867
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/123?utm_term=l298n+datasheet+pwm In PDF document text
    • https://jelijase.weebly.com/uploads/1/3/4/6/134694082/banujonukata.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410002/normal_600e48c8e1833.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414360/normal_60068da938cf0.pdfIn PDF document text
    • https://dovezoluwebib.weebly.com/uploads/1/3/4/0/134017866/1637223.pdfIn PDF document text
    • http://vujabix.22web.org/hp_color_laserjet_cp1215_driver_download_apple.pdfIn PDF document text
    • http://xonibiz.22web.org/99628900587.pdfIn PDF document text
    • https://wigabededonekan.weebly.com/uploads/1/3/0/7/130740374/8354856.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://s3.amazonaws.com/sazariwapa/sixejaja.pdfIn PDF document text
    • http://xibunagevidaze.rf.gd/anydesk_for_android_kitkat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8f53546-5f89-4ad2-a637-4e4e31147021/ropunovefa.pdfIn PDF document text
    • http://daxizupalapa.rf.gd/zinutiwavipalojoxo.pdfIn PDF document text
    • http://xovanesoku.epizy.com/pll_algorithms_wiki.pdfIn PDF document text
    • https://s3.amazonaws.com/netinuwa/33254981557.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97081506-fc6a-4f9f-bf5e-846c8fada84a/52355808717.pdfIn PDF document text
    • http://goxakimolo.epizy.com/metformin_1000_mg_tablets.pdfIn PDF document text
    • http://xofuzugavup.epizy.com/honda_dirt_bike_parts_store_near_me.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d965549-07c2-48a1-a86b-179a60b88214/pefamuvijixeza.pdfIn PDF document text
    • http://padanejelupe.rf.gd/59484686796.pdfIn PDF document text
    • https://s3.amazonaws.com/jeworurowam/diabetes_mellitus_diagnosis_nice_guidelines.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_off0000f09a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF09A 5216 bytes
SHA-256: 406b55c94e2c91bf3a392501d2ce56e54d9a48a410970ed1dc92152c6c0b4d3d
font_01_sfnt_off0001022a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1022A 11412 bytes
SHA-256: 8c968553787768352595af219825616e9913aa15e992575e161b60d0a2bb0727
font_02_sfnt_off0001296e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1296E 16036 bytes
SHA-256: 149cab45689013e99d1aa520d2e5234663aa5d8577b6aae5e423b5d60aeda4c1
font_03_sfnt_off00013dd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DD6 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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