Malicious PDF — malware analysis report

Static analysis result for SHA-256 76f2c0e80a7b708a…

MALICIOUS

PDF

72.0 KB Created: 2021-06-01 21:22:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 4eb6df24f22af3e9a1d03805120c0ba7 SHA-1: efd07575097d7b8211970a3f1fdb1195b610f20b SHA-256: 76f2c0e80a7b708a13badb9c68968fd225c86701ea0d551c47d46d66f3ed9de9
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high probability of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially harmful websites. The presence of a URL like 'https://inwebjor.ru/pbw?utm_term=how+much+should+i+feed+my+dog+calculator' indicates a lure to a calculator page, likely to mask malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://inwebjor.ru/pbw?utm_term=how+much+should+i+feed+my+dog+calculator PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4424692/normal_6018bc7decc3e.pdfIn PDF document text
    • https://meruxanige.weebly.com/uploads/1/3/1/6/131636855/gamufegupiza.pdfIn PDF document text
    • https://wopuwidutava.weebly.com/uploads/1/3/5/3/135322166/891cc5c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473919/normal_60125675d9e13.pdfIn PDF document text
    • https://vebiponexuxewi.weebly.com/uploads/1/3/4/7/134758887/mukadi.pdfIn PDF document text
    • https://nenimokevip.weebly.com/uploads/1/3/4/3/134336374/xabokebosinu_getizoteduje.pdfIn PDF document text
    • https://rudozusaviso.weebly.com/uploads/1/3/4/0/134041113/bepuko-vamoxib.pdfIn PDF document text
    • https://jolidanovuson.weebly.com/uploads/1/3/4/8/134868646/5095060.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368223/normal_5ff964f04459e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467564/normal_60335fb5dd89f.pdfIn PDF document text
    • https://nozifudofo.weebly.com/uploads/1/3/2/6/132681081/satetepixiwowivaso.pdfIn PDF document text
    • https://gubetixe.weebly.com/uploads/1/3/4/3/134314982/vukowebupibeme.pdfIn PDF document text
    • https://gixoxiri.weebly.com/uploads/1/3/4/7/134707295/tugopixu.pdfIn PDF document text
    • https://wirafoxojobukof.weebly.com/uploads/1/3/4/6/134608935/aeefe9a2d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zilebunod.pbworks.com/f/28918924617.pdfIn PDF document text
    • http://zufiwuz.pbworks.com/w/file/fetch/144457050/18213980756.pdfIn PDF document text
    • http://zeladejan.pbworks.com/w/file/fetch/144441360/how_do_i_charge_my_kangertech_evod.pdfIn PDF document text
    • http://fisukafetif.pbworks.com/w/file/fetch/144424911/pandas_get_one_column_as_dataframe.pdfIn PDF document text
    • http://xojipoxar.pbworks.com/w/file/fetch/144471951/how_to_use_vlc_on_android_auto.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93df5a49-feff-4539-ba48-f85f71e0dc64/gabozarekelogatomoviruv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e786104-21ad-4346-b486-479295fca1a0/are_bic_mechanical_pencils_number_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f1fcf7f-b375-4f92-9ff6-4c53dbb7630e/extra_virgin_olive_oil_chemical_formula.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_off0000dbc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC8 5592 bytes
SHA-256: 61fd69decef2eb4c1bf5f6f05db04ef5e9a59e344705e8a2df4bd3a3fbf7ac24
font_01_sfnt_off0000eebd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEBD 10532 bytes
SHA-256: 58d5d291ab896c2087a039f0528e3088c3862d9b1aa11be15f8a2fd0f9dac464