Malicious PDF — malware analysis report

Static analysis result for SHA-256 07a17c7ca4abc1cc…

MALICIOUS

PDF

81.5 KB Created: 2021-09-17 10:50:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 050fe5f664fe707b3cf819bf7c83bd8e SHA-1: e050e6fd35ceaa7772b64c6e9fd08db9e0bdf0af SHA-256: 07a17c7ca4abc1cc2c60b3b6ce64a40f258601ede29ce10d37fcec144f468ea3
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://stollerco.com/testingsites/advantage_aviation/assets/media/file/rudururozo.pdf In PDF document text
    • http://geriatriccarenewjersey.com/userfiles/files/93661285030.pdfIn PDF document text
    • http://www.ez4parcel.net/upfile/files/2021/09/12/84194197529.pdfIn PDF document text
    • http://beautifulmoda.com/userfiles/files/bibejezuwujet.pdfIn PDF document text
    • https://elger.cz/fckphotos/file/bakowakiviwibazifamikefip.pdfIn PDF document text
    • https://psiakocky-potisk.cz/webpagebuilder/ckfinder/userfiles/files/simuzuxegutom.pdfIn PDF document text
    • https://bedandbreakfastholten.nl/userfiles/file/dusezurevupajapa.pdfIn PDF document text
    • http://vning.net/filespath/files/20210902060652.pdfIn PDF document text
    • https://sergiomauri.com/images/file/zibijazo.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613a75f8ab3c0---20317879218.pdfIn PDF document text
    • http://mirutte.com/newsfiles/files/fesonolurapokupe.pdfIn PDF document text
    • https://kakakmanis.com/contents/files/juvatemosumujagarik.pdfIn PDF document text
    • http://career-id.org/ckfinder/userfiles/files/pejuvig.pdfIn PDF document text
    • http://huthamcauquanggiap.com/upload/files/97117916427.pdfIn PDF document text
    • http://allefrgycg.news-read.com/upload/files/48372194311.pdfIn PDF document text
    • https://mtydizayn.com/userfiles/file/kekukegazobixof.pdfIn PDF document text
    • http://djarkitek.com/temp/vinney/HTML/userfiles/file/55338383997.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/16684350601.pdfIn PDF document text
    • http://dkyangmei.com/uploadfile/file/2021091010490473499.pdfIn PDF document text
    • http://philboyd.com/sufimixoxurikuw.pdfIn PDF document text
    • http://konditsionery-zheleznodorozhnyi.ru/upload_picture/file/43453461763.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=poco+x2+update+miui+12PDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA8E 17812 bytes
SHA-256: d39b5cd38f58c15f953f9192f40c39101278fe1b3f2d433cd90eae21089f08ef
font_01_sfnt_off000108a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120B9 10632 bytes
SHA-256: 4adc547a36f1924c1c532b11d8b380047bc02612cfbb2196d4c48e23cc1ce670

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