Malicious PDF — malware analysis report

Static analysis result for SHA-256 c44af5ea3e811835…

MALICIOUS

PDF

73.0 KB Created: 2021-02-20 20:42:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 54e801fa10e662d149595343afd8b99f SHA-1: 99f4f1c990ddb9d06497a9e6ef74f4cd6b9ed920 SHA-256: c44af5ea3e811835d8be4d309b4e2780ab02ca5d986fe49a678f59f21f8cd6b3
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm or phishing operation. The ClamAV detection and ML classifier strongly indicate malicious intent. The embedded URLs and the heuristic firings related to PDF link farms point towards a campaign distributing malicious content or phishing for credentials.

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://baarspo.ru/123?utm_term=dell+optiplex+390+sound+drivers+for+windows+7 PDF link annotation
    • https://nozodipipagim.weebly.com/uploads/1/3/1/4/131438171/67ea91d2.pdfIn PDF document text
    • https://wunanowadile.weebly.com/uploads/1/3/4/6/134600652/fakabawijodovakipaza.pdfIn PDF document text
    • http://ledy66.net/kezejolufebimepumyui.pdfIn PDF document text
    • https://fudakima.weebly.com/uploads/1/3/0/7/130739810/567b49e456a03fa.pdfIn PDF document text
    • http://gufutaca3.xyz/man_swinging_golf_clubao592.pdfIn PDF document text
    • https://vomanoxugorufo.weebly.com/uploads/1/3/5/3/135331351/fulanojiv.pdfIn PDF document text
    • https://lulofaki.weebly.com/uploads/1/3/1/4/131453598/velen-taderaredub-lunulino-zafaxakov.pdfIn PDF document text
    • https://noxagutut.weebly.com/uploads/1/3/4/4/134483949/b73d3816eb5.pdfIn PDF document text
    • https://tedawubav.weebly.com/uploads/1/3/4/3/134376018/6805da8f5493f.pdfIn PDF document text
    • http://badgesverified.com/xesigqkdr2.pdfIn PDF document text
    • https://sugelazo.weebly.com/uploads/1/3/4/7/134767002/fuzota-redisat.pdfIn PDF document text
    • http://meetlait.pro/74727347198pt6nd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xenegivijofawok.rf.gd/xawagapijobivukinurogo.pdfIn PDF document text
    • https://s3.amazonaws.com/sepawi/why_does_my_samsung_galaxy_s5_keep_turning_on_and_off.pdfIn PDF document text
    • https://s3.amazonaws.com/jonora/43002059506.pdfIn PDF document text
    • http://tuvinuragoma.epizy.com/alexio_kawara_songs_free.pdfIn PDF document text
    • https://s3.amazonaws.com/leributafa/acestream_android_buffering.pdfIn PDF document text
    • https://s3.amazonaws.com/zufojadibi/basel_ii_norms.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_off0000ddb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB3 5584 bytes
SHA-256: 0d7c4f6db157aa12911cd110485cca576c122d1684387f91284b82b03f9d9e28
font_01_sfnt_off0000f0ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0EA 11748 bytes
SHA-256: 6cfd7ae74357b740e9b16a98c52499c5521961b463d18d319bb82081fce05351

Open this report in the interactive analyzer, or submit your own file for analysis.