Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ad81c0077dd1bcf…

MALICIOUS

PDF

75.4 KB Created: 2021-03-17 00:13:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 8aff5ea419a22e195a6e67c8e36ecb49 SHA-1: d48a7c978fe104fc998950021a6e926a51e4fd2a SHA-256: 4ad81c0077dd1bcf2d102c7977796b79cceea359045a3df11e1dd35fb98fa650
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains numerous embedded URLs, with a primary one pointing to 'nipisod.ru', likely serving as a lure. The document body is heavily obfuscated, but the presence of external URIs and link farm heuristics suggests an attempt to redirect users to malicious content. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://nipisod.ru/strik?utm_term=avent+microwave+steriliser+how+to+use PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4446646/normal_6048e012db839.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402488/normal_5fc5ecefb2215.pdfIn PDF document text
    • https://kidupexedu.weebly.com/uploads/1/3/4/6/134683121/fovadumub_goxuveb_novujonovunusa_luwadi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495040/normal_60287bbc44682.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369165/normal_60258253e5788.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481162/normal_603f0964d76a6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425238/normal_5fe040bdba5fe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366362/normal_603903f6943c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411691/normal_60120a0e2122b.pdfIn PDF document text
    • https://cdn.sqhk.co/xamizine/ujiQLfx/kelobidor.pdfIn PDF document text
    • https://cdn.sqhk.co/birugafomafo/ftgjgi8/10714958825.pdfIn PDF document text
    • https://foxaxefaga.weebly.com/uploads/1/3/1/3/131398491/2893050.pdfIn PDF document text
    • https://fuxozixer.weebly.com/uploads/1/3/4/6/134694245/6712092.pdfIn PDF document text
    • http://silikidabog.22web.org/11181981346.pdfIn PDF document text
    • https://nesurufaratetud.weebly.com/uploads/1/3/1/4/131408203/6960506.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/123d8af6-f22d-4057-b2aa-e80d65ab8e13/advantages_and_disadvantages_of_internet_mobile_phones_social_networking_wikipedia.pdfIn PDF document text
    • http://gezexibubaju.rf.gd/jaded_london_jeans_size_guide.pdfIn PDF document text
    • http://tonaligu.epizy.com/tonitizatovedos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c73a945-5aa5-4b47-9926-6f3c0d0726bf/xajonufodo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b9218e7-f3ba-4ae5-ba05-babf7df593a5/beloved_audiobook_free_download_mp3_in_urdu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d198.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD198 5180 bytes
SHA-256: f4ecdead89ae24790562c5daa8586c18fdce693f36582b58f9e9b7a6d3650af7
font_01_sfnt_off0000e31c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE31C 11236 bytes
SHA-256: 043ccc2735e7bbc252f22a6f516bba68f5a0937a5eb4713a16ef87b605d765bf
font_02_sfnt_off000109a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A5 16064 bytes
SHA-256: ae2ed4598cc72dce93bab46ece0645dd21a9f619c8cc811d716509e804a860a6

Open this report in the interactive analyzer, or submit your own file for analysis.