Malicious PDF — malware analysis report

Static analysis result for SHA-256 e991ddd35da3a515…

MALICIOUS

PDF

75.1 KB Created: 2021-04-07 23:49:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: d20c49512cc38f2ac3e67bd5c8e92b67 SHA-1: ebb07102cfb61b4c99c49763b172307ebb44be98 SHA-256: e991ddd35da3a51578df3ed8b476e58d817ee379359a639b86a140c4c86cdf5e
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and is flagged by ML classifiers and ClamAV as malicious. The document body, though heavily obfuscated, appears to be a lure related to refrigerator repair, suggesting a phishing or malware distribution attempt. The presence of many external URIs and the link farm heuristic indicate a high likelihood of redirection to malicious content.

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
  • 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://gimoguvi.ru/strik?utm_term=how+do+you+fix+ice+build+up+in+a+samsung+refrigerator PDF link annotation
    • http://jitudowifite.iblogger.org/takivawalanek.pdfIn PDF document text
    • https://gipewiraxo.weebly.com/uploads/1/3/5/3/135334151/xagufirarudo_xijomorovotoxu_safirutug.pdfIn PDF document text
    • https://cdn.sqhk.co/lexikegije/2rhfjiC/server_list_for_minecraft_pe_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/paxelababeg/lhbghCV/somogotuvugafemonuj.pdfIn PDF document text
    • https://xigolomo.weebly.com/uploads/1/3/4/4/134483438/golenojuwu.pdfIn PDF document text
    • https://bubipirem.weebly.com/uploads/1/3/6/0/136086135/xeforutal-bakupawa-goluxebakoda.pdfIn PDF document text
    • https://juladugalevatib.weebly.com/uploads/1/3/4/3/134385664/2ac60.pdfIn PDF document text
    • https://cdn.sqhk.co/fuvebopeweb/eAHubXt/janiro.pdfIn PDF document text
    • https://cdn.sqhk.co/wadelovelo/ydjgMib/30343877455.pdfIn PDF document text
    • https://talunijepi.weebly.com/uploads/1/3/4/5/134599753/6aab154c8110e.pdfIn PDF document text
    • https://bezodidamivozel.weebly.com/uploads/1/3/2/6/132683328/9295213.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fixetuw.rf.gd/steam_boiler_system.pdfIn PDF document text
    • http://bafimilatape.epizy.com/tatalaksana_abortus_imminens.pdfIn PDF document text
    • https://s3.amazonaws.com/fejififimaketo/xoxuvona.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0ce4c5b-2e67-46e7-b062-8fdd9697c2bf/maytag_dryer_wont_start_just_clicks.pdfIn PDF document text
    • https://s3.amazonaws.com/datarofapakil/86738338898.pdfIn PDF document text
    • https://s3.amazonaws.com/wivunonovef/87614164454.pdfIn PDF document text
    • http://wazinupizut.epizy.com/dazureponivisifej.pdfIn PDF document text
    • https://s3.amazonaws.com/likerajatob/9911470906.pdfIn PDF document text
    • http://warunero.rf.gd/jepodexolij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7592eb17-d880-4720-9b31-a0db2d5a9b09/algebra_1_unit_2_test_equations_and_inequalities_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/dixaleko/zinukusanotulavu.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_off0000e6e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E8 5840 bytes
SHA-256: 34168b6ef24bd64f43dfec65ba6d9819f69b2eefe933f24e3d4a7fdf94f8aae9
font_01_sfnt_off0000facc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFACC 10412 bytes
SHA-256: 69efa30da2b3d36c50150f90590156e84d2effb99a121197141fb93f9f49f8e3

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