Malicious PDF — malware analysis report

Static analysis result for SHA-256 786b66c71514ac7d…

MALICIOUS

PDF

74.9 KB Created: 2021-05-31 17:03:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 06ee3d8f02b01a62c6e3c119ac073ed1 SHA-1: 50460bc69ea088acdbc8a0da69c4aab66ca17d23 SHA-256: 786b66c71514ac7d70a188a4d54b59d74d78c317d523f37da231f2ba76606d5c
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The embedded URLs are the primary indicators of compromise, directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://inwebjor.ru/pbw?utm_term=how+to+change+clock+display+on+apple+watch+5 PDF link annotation
    • https://nuzilemuf.weebly.com/uploads/1/3/4/4/134479477/639e73536.pdfIn PDF document text
    • https://datezovog.weebly.com/uploads/1/3/0/7/130776229/773513.pdfIn PDF document text
    • https://kewalagaxed.weebly.com/uploads/1/3/4/8/134864879/cb74704690d9.pdfIn PDF document text
    • https://defupaga.weebly.com/uploads/1/3/2/6/132681490/boxex.pdfIn PDF document text
    • https://siteketu.weebly.com/uploads/1/3/4/3/134362374/3b0cb23b0734.pdfIn PDF document text
    • https://mebusogaduvorit.weebly.com/uploads/1/3/0/9/130969439/583620.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389108/normal_5fc80acd2359a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389353/normal_604cd4b5c09f0.pdfIn PDF document text
    • https://gogidexiveje.weebly.com/uploads/1/3/4/7/134762038/9747044.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443292/normal_5ffe7333a04b8.pdfIn PDF document text
    • https://resuzomesidi.weebly.com/uploads/1/3/4/7/134746605/kejig.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497395/normal_60193632cd8e9.pdfIn PDF document text
    • https://noxojinuk.weebly.com/uploads/1/3/4/4/134479051/gilizo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467979/normal_606b1f44cf1dd.pdfIn PDF document text
    • https://gelasinez.weebly.com/uploads/1/3/4/7/134763890/49be930a2e5ea.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/c162095b-bf20-4d53-aa6c-62e842efa6e6/kamokenis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15042502-0c40-4f33-892c-88632cb2e7ad/6_series_samsung_tv_70.pdfIn PDF document text
    • http://botinuba.pbworks.com/w/file/fetch/144414741/82552019893.pdfIn PDF document text
    • http://mumubib.pbworks.com/w/file/fetch/144414627/78988878861.pdfIn PDF document text
    • http://xedidovetaw.pbworks.com/w/file/144411246/how_do_you_change_your_voicemail_password_on_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bcdeb949-378f-429f-a321-b860253ae902/3019670953.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff6f61e1-0d07-45f8-87ac-c544383035f5/somewhere_the_birds_are_singing_lyrics.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_off0000e5ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5EC 5584 bytes
SHA-256: e9d1959dc787ca739fcfc4f9e2f6ddec5ec4132ad2fdd01c94d2b715e2e19d72
font_01_sfnt_off0000f90e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF90E 10400 bytes
SHA-256: 3d22353c6f118443e341fc236d95497ce603590a1a2a0c68474e443693cd75bf