Malicious PDF — malware analysis report

Static analysis result for SHA-256 86a050d60995b07b…

MALICIOUS

PDF

80.2 KB Created: 2021-03-08 16:00:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d44d26628bbe8b8e8dbb6448da3fcbc3 SHA-1: 71139ae07cc1fdecb2876bb40488512b1b6e1bfa SHA-256: 86a050d60995b07b580cddd12003805990b96ec1e464ce342ae3f9df9a19eac8
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicative of a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. While no scripts were directly extracted, the PDF structure and embedded URIs point towards an attempt to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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.
  • 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://midufefew.ru/aws?utm_term=kathy+lee+gifford+worth
    • https://moniraje.weebly.com/uploads/1/3/1/4/131438162/nojejawuvabuli.pdf
    • https://static.s123-cdn-static.com/uploads/4503584/normal_5ffca53b3911d.pdf
    • https://static.s123-cdn-static.com/uploads/4374185/normal_5fc79793d7947.pdf
    • https://benedelewerovil.weebly.com/uploads/1/3/1/3/131384674/dekegonewogumu.pdf
    • https://zafudibibini.weebly.com/uploads/1/3/4/1/134108698/surabifazem.pdf
    • https://cdn-cms.f-static.net/uploads/4486965/normal_6019e1ec1425e.pdf
    • https://tonavamajarow.weebly.com/uploads/1/3/4/6/134694337/maluratepunut.pdf
    • https://cdn-cms.f-static.net/uploads/4495997/normal_601032c436775.pdf
    • https://wojaxesisitofem.weebly.com/uploads/1/3/4/7/134717171/994d969d5ed8c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://kotokadi.rf.gd/sharp_aquos_quattron_troubleshooting.pdf
    • https://s3.amazonaws.com/fejenijovekozu/dasinadaxedekelegobijim.pdf
    • https://0b21792c-a699-4cf4-8833-5910c6ad58af.filesusr.com/ugd/b0b521_bf69052e02ef4c3b871f9a65169edbaa.pdf?index=true
    • https://2e81f42f-67f9-46a9-89e2-a5f3ab3b03ee.filesusr.com/ugd/f138f5_2b1f591c9aed4b34ac9cd31a7d1e32ea.pdf?index=true
    • https://c6111751-42b6-464f-a8b1-832d492ff999.filesusr.com/ugd/3d0627_1862889f657a4427af0f73469c560af9.pdf?index=true
    • https://s3.amazonaws.com/waxegatulo/cellular_respiration_inquiry_lab_answers.pdf
    • https://2eeb51df-07ba-4372-80d9-1ef4646fc7f7.filesusr.com/ugd/6af210_eb7a2073adf34a6aa18e763295c60042.pdf?index=true
    • http://zuwewabarabin.epizy.com/brief_information_about_madhya_pradesh.pdf
    • https://51bf459c-6b46-41b0-863f-532cf8a77e0d.filesusr.com/ugd/2eedf1_b5e520bdc479495fa1d5f79add8b25d6.pdf?index=true
    • https://def26600-86c9-4442-a738-094ddf2992d1.filesusr.com/ugd/eb5a6a_a5800e8df44b411598db992cc543d54b.pdf?index=true
    • http://jipokogave.epizy.com/chrome_flags_android_address_bar.pdf
    • https://da550aaf-34ae-4f9b-ad82-7836b82beebe.filesusr.com/ugd/a203e6_e36a055cce8e445cbbabd497389c6e1d.pdf?index=true
    • https://de99934f-f465-4d69-af5e-14f317c0a7c6.filesusr.com/ugd/4fea5c_d3c3c6f449884ca7bb681ccd06d01f4b.pdf?index=true
    • http://zabazajalugawez.epizy.com/buxakebupeliwude.pdf
    • https://s3.amazonaws.com/tuxalowafokuvo/vowofutivejotetowowa.pdf
    • https://4b67404f-136a-46a0-9cf3-151f2d38faab.filesusr.com/ugd/241fd5_9eb15f7edbba4046b29562113a017a6d.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc38.bin
71979050601adcdb8fdd102403e18c37269853cbf99100ca6332bee55a5ffdf1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC38 5152 bytes
font_01_sfnt_off00010ddd.bin
8e7f49bd899639da8c0c796bebf5b4b9553455a74f6ce38832c5b5eb951ba54f
pdf-font-stream PDF embedded font (sfnt) at offset 0x10DDD 11000 bytes