Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff622fdcbd996d42…

MALICIOUS

PDF

68.0 KB Created: 2021-02-28 07:15:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 56ec329b74393a482d094e555389b6d8 SHA-1: 0fce58a2906894d20ba63a0b160d1f3a2c8a8de5 SHA-256: ff622fdcbd996d4290a7f68ad2daad553400d631d8981cb15afe479cbfe690a6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://maypoin.ru/aws?utm_term=making+and+breaking+the+grid+second+edition+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4477156/normal_601f897ac890c.pdfIn PDF document text
    • https://movalibixijol.weebly.com/uploads/1/3/2/6/132682530/3216819.pdfIn PDF document text
    • http://taygerr.com/two_asteroids_collide_2020_augustm3rce.pdfIn PDF document text
    • http://rinobozawizuvew.iblogger.org/how_do_you_do_pre_algebra.pdfIn PDF document text
    • https://mokoxofedig.weebly.com/uploads/1/3/4/8/134891763/1f77cd38e.pdfIn PDF document text
    • http://karnaval.host/vugaxijepodnn0sc.pdfIn PDF document text
    • http://donbetosstreettacos.com/astral_projection_guide_bookxgnzv.pdfIn PDF document text
    • http://jigitozunawada.66ghz.com/animated_water_powerpoint_template_free.pdfIn PDF document text
    • http://luchdobro.site/283351275279zlas.pdfIn PDF document text
    • http://housefashion.ru/zombie_day6_color_codedmh78r.pdfIn PDF document text
    • https://ropemobajakim.weebly.com/uploads/1/3/4/6/134694841/1ad5e814fb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501383/normal_5ffc1808a7288.pdfIn PDF document text
    • http://mavpa.fun/data_analysis_methods_for_semi-structured_interviewsn8bsd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wateduwixe.epizy.com/55784803139.pdfIn PDF document text
    • https://s3.amazonaws.com/jamuluvuvava/wokiwu.pdfIn PDF document text
    • https://s3.amazonaws.com/popisiburewixuj/7354818487.pdfIn PDF document text
    • https://s3.amazonaws.com/kijelopazekune/kegaxigafedewe.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_off0000ccee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCEE 5592 bytes
SHA-256: 6271dfb2c5f445dbcf2eba720bfc37c6d29ebf771c2c4f248768a9b6dae31960
font_01_sfnt_off0000dffa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFFA 10132 bytes
SHA-256: 9356adac9e4d7a6969d67afdc3b0e131893a868513775e745bd9d7032e977a33