Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec943efb6cb01341…

MALICIOUS

PDF

98.9 KB Created: 2021-06-05 21:10:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: dbde787031714447690891aa6ea4260e SHA-1: 286c1341aa35f5603407caf542cb69905ff7e997 SHA-256: ec943efb6cb0134148e950ede25f1741c1fb33e973617af967df4691ffa4b0c7
134 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The presence of a 'download button' heuristic and an external URI pointing to a suspicious domain suggests a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains keywords related to driver downloads, reinforcing the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://inwebjor.ru/pbw?utm_term=pci+simple+communications+controller+driver+download+lenovo+g50 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4411944/normal_5fcb397d48451.pdfIn PDF document text
    • https://linepapimufuto.weebly.com/uploads/1/3/1/6/131637640/6783222.pdfIn PDF document text
    • https://jelisewisu.weebly.com/uploads/1/3/1/4/131410299/3771021.pdfIn PDF document text
    • https://jevupatumatawi.weebly.com/uploads/1/3/4/3/134377955/nixef.pdfIn PDF document text
    • https://zejanedigerexig.weebly.com/uploads/1/3/4/7/134757062/wenatisusuwovu-tipofunetebaxob-zajugise-wolaki.pdfIn PDF document text
    • https://sizegetode.weebly.com/uploads/1/3/4/3/134309939/dilowexidipil.pdfIn PDF document text
    • https://tibesegekor.weebly.com/uploads/1/3/4/4/134495245/wovaxiliwitepawuxo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418192/normal_600d17fede571.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494431/normal_604739f156daf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471488/normal_60570ee034f55.pdfIn PDF document text
    • https://tizosofamininu.weebly.com/uploads/1/3/4/3/134352685/gemod.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/c4a1208a-4563-4336-9b16-503a0fabf333/the_laramie_project_10_years_later.pdfIn PDF document text
    • http://lekuzax.pbworks.com/w/file/fetch/144413184/air_force_x_group_english_syllabus.pdfIn PDF document text
    • http://jizakatum.pbworks.com/w/file/fetch/144520869/7287790220.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc79ba0f-2706-4970-a7ea-d38ad7ab3410/marlin_336_xlr_specs.pdfIn PDF document text
    • http://xetibubib.pbworks.com/w/file/fetch/144425187/sebinokibulodajele.pdfIn PDF document text
    • http://zowonixepor.pbworks.com/w/file/fetch/144441798/feresi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08807cb3-9a84-4004-ae77-ec4b1d391469/vukipalofafoviropegarol.pdfIn PDF document text
    • http://sujagajo.pbworks.com/w/file/fetch/144525597/11488936057.pdfIn PDF document text
    • http://supatibu.pbworks.com/f/zanoriwisuxodetik.pdfIn PDF document text
    • http://togusan.pbworks.com/f/xotubasilulobu.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_off00011b14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B14 3024 bytes
SHA-256: 1150934a9ffc8e06a5e54a6d41d7d4b2ceb755f6233991ad0ed1260b9846aa46
font_01_sfnt_off000125e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125E4 5812 bytes
SHA-256: bda2698df427de1ce99ad379de1b982991d68b7906056433d733db8ca40f541d
font_02_sfnt_off000139b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139B0 14604 bytes
SHA-256: 8f7db48156e6e2801ffce699991bfc9aad2b811d7b7a7d072e02f38bbb0612b5
font_03_sfnt_off000165df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x165DF 16060 bytes
SHA-256: d7dbcefd5a9d087f9dbd48d87e5b82950a900fa0f666d4a1f78598b818f3f613