Malicious PDF — malware analysis report

Static analysis result for SHA-256 16834765900ee966…

MALICIOUS

PDF

86.4 KB Created: 2021-05-18 13:34:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 96ed171b2b536c02e7e4a2a92386ade5 SHA-1: 23654d31b77c28dc0845284fb29116b85ffd0e74 SHA-256: 16834765900ee96666e90304339913c9a3a8df389aab633a6a542926e97c1289
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 of which are hosted on disposable domains, suggesting a link farm designed to direct users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document designed to exploit user trust.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://ponafet.ru/strik?utm_term=information+technology+project+management+7th+edition+pdf+free+download PDF link annotation
    • https://senidexug.weebly.com/uploads/1/3/0/7/130775540/zebalawu-vajemigufarinal.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426828/normal_6046dfec0f249.pdfIn PDF document text
    • https://motaxajofepox.weebly.com/uploads/1/3/1/3/131381237/dowusowez-pipifapeder.pdfIn PDF document text
    • https://popokafiri.weebly.com/uploads/1/3/1/4/131437291/susexulevigadon_dezumulede.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374533/normal_602b4942bf4f4.pdfIn PDF document text
    • https://fuzefiwojagolo.weebly.com/uploads/1/3/5/3/135308179/edd18a63fae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367947/normal_606a6b9813342.pdfIn PDF document text
    • https://mulokigapasol.weebly.com/uploads/1/3/1/0/131070847/680166.pdfIn PDF document text
    • https://namebobave.weebly.com/uploads/1/3/0/7/130739452/zusote.pdfIn PDF document text
    • https://gunobodupisar.weebly.com/uploads/1/3/4/6/134677737/2534727.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://uploads.strikinglycdn.com/files/a5ccfa16-c65e-4b9f-97de-00cb997ebecf/bexubemudozenaketam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa643be3-014d-4b6c-b288-40e2cd5dbb39/siganoparoraja.pdfIn PDF document text
    • https://s3.amazonaws.com/tobito/2298790512.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0aefc0a3-064b-41fa-983d-10cc9a17109e/what_is_college_101_class.pdfIn PDF document text
    • https://s3.amazonaws.com/murudute/wizajarawawi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b06a4ef1-f9eb-4975-bdb9-e5258d0d21f3/99023062903.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1085026-5f47-413f-a853-3824407e9114/economic_loss_doctrine_affirmative_defense.pdfIn PDF document text
    • https://s3.amazonaws.com/kufazete/modern_calligraphy_letters.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f4a9398-fbb7-4a0b-a17a-a91f9aa506e0/how_to_calculate_interest_due_at_closing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0eee918d-5cc3-497b-a47f-8c1d59ba0a31/fingerstyle_guitar_playing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ddc15895-e138-4d64-b23a-2c0c3a89566b/how_to_monitor_power_usage.pdfIn PDF document text
    • https://s3.amazonaws.com/kizugokofo/vopiferinesalokewev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ec4e0f4-ce58-4bab-94d8-56efffb9778f/sovuwa.pdfIn PDF document text
    • https://s3.amazonaws.com/zobuwubedak/rupezuzuke.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10223 5468 bytes
SHA-256: 0d84e0fd215d375616f777afe8a8da30ab83304c468298d51e0ee7d98b501b4a
font_01_sfnt_off000114a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114A6 11220 bytes
SHA-256: d73b33d9f0f10f098a64126bf797d6da6e207261f1944083b1a8c5c7a5e4aae1
font_02_sfnt_off00013b10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B10 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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