Malicious PDF — malware analysis report

Static analysis result for SHA-256 5117d00413ab3f54…

MALICIOUS

PDF

72.8 KB Created: 2021-04-10 16:20:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: abb8d887392e4c8caa65e24bc63ab06e SHA-1: 7c6ed7140eb436e59750c1972fe1f6f4c7d59c2c SHA-256: 5117d00413ab3f540e813063ac8d703c876d849b84559e5dcfad38517680b9b7
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, indicating a link farm or SEO spamming tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded URLs and the document's structure point towards a spearphishing attachment, aiming to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://soxebez.ru/strik?utm_term=tabla+de+equivalencias+pulgadas+a+milimetros+pdf PDF link annotation
    • https://nirereki.weebly.com/uploads/1/3/1/4/131483126/1611813.pdfIn PDF document text
    • http://tonilakifak.mypressonline.com/kaketevukibabajerat.pdfIn PDF document text
    • https://texerazijibegu.weebly.com/uploads/1/3/5/3/135302316/kazafu-puninevinol.pdfIn PDF document text
    • http://dusanaputojinon.mygamesonline.org/psychrometric_chart_example_problems.pdfIn PDF document text
    • http://texifudosino.mygamesonline.org/celebrity_definition.pdfIn PDF document text
    • http://bafakuvim.sportsontheweb.net/59455340575.pdfIn PDF document text
    • https://ridewavovelomu.weebly.com/uploads/1/3/4/6/134697160/22ba935674e11.pdfIn PDF document text
    • http://kakorixow.mygamesonline.org/62080875447.pdfIn PDF document text
    • https://sojomirolasa.weebly.com/uploads/1/3/4/3/134325131/zematifeto-sitemeroxisej.pdfIn PDF document text
    • https://besuweleterum.weebly.com/uploads/1/3/2/8/132814030/ef9359f2.pdfIn PDF document text
    • https://zokibiruxe.weebly.com/uploads/1/3/5/3/135326092/ec9d86e78c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4b0cdf75-2e42-4830-99f1-bbdbaec3f661.filesusr.com/ugd/891219_1c92349f28b14fa1a62b49f5a7e3be58.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/119a2fc1-e1d1-4d37-afc5-f152f8b8a438/24535375430.pdfIn PDF document text
    • https://fad58b31-c538-4d3f-828d-7998eec853b9.filesusr.com/ugd/7e6083_95c121b807d048cebe17a2787c75ca2e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/044d1da3-1afd-44a4-a10f-cb3a6ca855e4/89485057653.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0fe6b5a8-f124-4053-9b97-54f765fe9ac8/qu_significa_la_palabra_aleluya_en_la_biblia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91ea0154-6ad6-463e-a994-5dbfe255b8e8/repumelexuru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98741256-0aa5-4961-ba26-be8bedeec3ad/how_to_pair_sennheiser_rs_175_headphones.pdfIn PDF document text
    • https://7e8267f5-6380-480e-ad72-df526eaefc07.filesusr.com/ugd/cbe325_312129b3710f45dfb35f9c4226f73960.pdf?index=trueIn PDF document text
    • https://43e3b293-20b6-4b74-9f7d-0eefffb4d2df.filesusr.com/ugd/11595e_23662e9dec48490c94d0e949db2dade5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e78ad9e-119e-41df-b818-347745a07d22/how_to_replace_belt_in_maytag_dryer.pdfIn PDF document text
    • https://6acf0ca1-aa41-4771-8b91-54baff69ee7f.filesusr.com/ugd/7d1dc9_75fc4300a69d45b8981f398e1405023f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/390a8c1f-0122-433f-896c-a7ccd2ab84df/jipunodupi.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_off0000dc22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC22 5748 bytes
SHA-256: 33ed9c00f45dd4f23de0f9e4e0fb3fd1147795968cbebf464c1c4e302fbe1db7
font_01_sfnt_off0000ef96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF96 10824 bytes
SHA-256: 88962974fc54d181d6fb5e8aed211b3128c1e5f16c37b6681ca6b7b8bda100f2

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