Malicious PDF — malware analysis report

Static analysis result for SHA-256 ceed984e23756eba…

MALICIOUS

PDF

77.7 KB Created: 2021-02-22 15:26:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: c0d8e1b87ebfffa0a1131ba40868cd3f SHA-1: 9d03e27d84b156c1927ee50583c0b8278596bcfa SHA-256: ceed984e23756eba5c2899a02aaca587cced737c8a90cace7ef107da43fef072
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains and potentially malicious PDF files, as indicated by the 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ML classifier and ClamAV also flagged this as malicious. The embedded URLs suggest a phishing or malware distribution scheme, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jottigo.ru/strik?utm_term=metal+gear+solid+v+the+phantom+pain+how+to+install+mods PDF link annotation
    • http://front-glass.website/new_york_city_threataotgc.pdfIn PDF document text
    • https://sezibuginodeso.weebly.com/uploads/1/3/4/4/134470526/6aa8c003f3.pdfIn PDF document text
    • https://xulazipilo.weebly.com/uploads/1/3/5/9/135958699/pubetoz.pdfIn PDF document text
    • https://verigidiloje.weebly.com/uploads/1/3/0/8/130874422/gajefidamiresinipi.pdfIn PDF document text
    • https://tekudijasefemo.weebly.com/uploads/1/3/2/7/132740256/5760746.pdfIn PDF document text
    • https://rufajesovulibo.weebly.com/uploads/1/3/4/2/134235528/pedusunobu-sokuzamubosotu.pdfIn PDF document text
    • http://instapriz365.site/barron27s_ielts_superpack_2018oq2hz.pdfIn PDF document text
    • https://bevereka.weebly.com/uploads/1/3/0/7/130739533/wopusatolalifow.pdfIn PDF document text
    • http://xujilutobidiko.iblogger.org/95766510561.pdfIn PDF document text
    • https://fekugutupufug.weebly.com/uploads/1/3/4/8/134876907/8747277.pdfIn PDF document text
    • https://jaragamonobuwuf.weebly.com/uploads/1/3/5/3/135346236/makedaserif.pdfIn PDF document text
    • https://renobikedasel.weebly.com/uploads/1/3/4/8/134897329/d2087973.pdfIn PDF document text
    • https://zaxixeresez.weebly.com/uploads/1/3/1/8/131871416/zaziw-tejipumem-ratadotiv-waxuzeparidana.pdfIn PDF document text
    • https://xesukalo.weebly.com/uploads/1/3/5/3/135311970/3303162.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/muvemasoxaji/ginituxosapalemibe.pdfIn PDF document text
    • https://s3.amazonaws.com/xonobijikivo/jugs_pitching_machine_parts_ebay.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_off0000f207.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF207 5528 bytes
SHA-256: f8a72ea3bb2fc0bcfed245d5c667523ed56ecace05a50e81d62999603b7bb080
font_01_sfnt_off000104cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104CD 10652 bytes
SHA-256: 748c89db0217ee2f7c48f0d611ca35b21ac47fa5ac567b91f1599866e6ed2416

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