Malicious PDF — malware analysis report

Static analysis result for SHA-256 d833a4ccde4898ea…

MALICIOUS

PDF

116.7 KB Created: 2021-03-18 13:09:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 7ea806e495305ae2ce8e5d894aca0eee SHA-1: 78c7e0548b772466d411f965c273f143b8addf10 SHA-256: d833a4ccde4898ea27deffc67f7ecffc403970683edf11cd6397f34301481b21
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing attempt. The primary URL, 'https://resalured.ru/strik?utm_term=essentials+of+systems+analysis+and+design+5th+edition+solution+manual+pdf', is presented as a search result for academic materials, likely to trick users into visiting a malicious site. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 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://resalured.ru/strik?utm_term=essentials+of+systems+analysis+and+design+5th+edition+solution+manual+pdf PDF link annotation
    • https://mirovufi.weebly.com/uploads/1/3/5/9/135958785/rokukib.pdfIn PDF document text
    • https://jazolesapixol.weebly.com/uploads/1/3/1/4/131453041/4cb60f.pdfIn PDF document text
    • http://rukakev.iblogger.org/approximation_math_questions.pdfIn PDF document text
    • http://pusaburuku.22web.org/41364488319.pdfIn PDF document text
    • https://lofemeraj.weebly.com/uploads/1/3/2/8/132814933/zizalow-roralimuzozef-fuzafotoxexemo.pdfIn PDF document text
    • https://wibotutez.weebly.com/uploads/1/3/4/0/134012840/7634877.pdfIn PDF document text
    • https://gajatizu.weebly.com/uploads/1/3/5/3/135315297/runatudikif-nenesasagirisif-xojoxukibek-walufuwus.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dutulekobewamuj.epizy.com/economic_development_definition_by_economists.pdfIn PDF document text
    • https://0a38098d-26c8-4844-ab0b-2dfc398d7f8d.filesusr.com/ugd/fffd55_cdfd24cadb0e4f0e93b240b9972b5a21.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3eda71b-6733-43b4-9621-00b5cd236c1e/why_is_archetypal_criticism_used.pdfIn PDF document text
    • http://bapadukaf.epizy.com/kindergarten_english_worksheets_free_printables.pdfIn PDF document text
    • https://b5d51143-f34a-4a4f-9265-6917490cb775.filesusr.com/ugd/9f69bd_9a8202f63ca94ccd82d146037010cd6d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gulapore/wanetitudobitapej.pdfIn PDF document text
    • https://02e0da19-eac5-4521-950b-4e410541bf1c.filesusr.com/ugd/516249_81bf14ec8cec4c6bae70a47377511cc3.pdf?index=trueIn PDF document text
    • http://mixalibomibu.epizy.com/zixabovira.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71eb273e-89ab-49c4-bea5-0536705d88fe/cuisinart_ice_cream_maker_recipes_heavy_cream.pdfIn PDF document text
    • http://jamurujitexezi.epizy.com/anova_sous_vide_owners_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a41019f-545e-4752-b845-16b31b7835cf/dawuxekeruzosapumewufot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3cfe2689-33f7-43d6-9f2f-a4c56f854a3e/82823294186.pdfIn PDF document text
    • http://kamabutexukawiv.rf.gd/25019165555.pdfIn PDF document text
    • https://s3.amazonaws.com/donarepemi/sazilovore.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ecde37c-5195-4df8-87d5-2a30c63b2ab3/english_grammar_lessons.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_off00017ebc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17EBC 1656 bytes
SHA-256: 84a8d1358cc218f6ac20fbb7db6c4edb9d40e6b1ab58c7cc46927c51e1285fa9
font_01_sfnt_off000186fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x186FC 5540 bytes
SHA-256: cf9429c53c5135146245cfeef4a266fb50bf148751b2357c841ebb4af2e51de2
font_02_sfnt_off000199c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x199C8 12364 bytes
SHA-256: ac0dd6bc3a7f14bd9e58bc864de60e2e445d2572713b4635c38345a3188a2c22