Malicious PDF — malware analysis report

Static analysis result for SHA-256 343dc6598f654982…

MALICIOUS

PDF

81.1 KB Created: 2021-09-13 11:03:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 32b49d012f72125e77ec2d6aba3a5222 SHA-1: b8dd1fab6e5883c3d2e41e4432fa37f7710d29af SHA-256: 343dc6598f6549827ea9e79c94b129f4b78c767ba1e8818dda46b5825838ebd1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which are hosted on disposable domains and appear to be part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it is designed to redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://laborke.ru/uplcv?utm_term=la+la+land+watch+online PDF link annotation
    • https://robindayne.com/ckfinder/userfiles/files/mepotat.pdfIn PDF document text
    • http://studioprogettoarchitettura.eu/userfiles/files/wilutikani.pdfIn PDF document text
    • http://archiw.gbpopatowiec.pl/img/upload/files/25989548716.pdfIn PDF document text
    • http://wasserburg.pl/userfiles/file/sowezakibebasajofapopu.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/15110840541.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/161315a86b4a2c---92081824686.pdfIn PDF document text
    • http://ventmetal.ru/userfiles/files/tawekunadofepapegudi.pdfIn PDF document text
    • http://cnsgafgl.netsociality.com/upload/files/33108393342.pdfIn PDF document text
    • http://tochalco.com/uploads/files/32932346978.pdfIn PDF document text
    • https://masihpt1.com/contents/files/19908120577.pdfIn PDF document text
    • http://rspon.pl/images/wyswig_images/file/83368417756.pdfIn PDF document text
    • http://hftyby.com/upload_fck/file/2021-9-2/20210902044638886175.pdfIn PDF document text
    • https://karaari.leaddeehub.com/userfiles/files/60551714311.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/72912051209.pdfIn PDF document text
    • https://inarsindbari.org/uploads/xezofew.pdfIn PDF document text
    • http://abarappresentanze.it/userfiles/files/puwoxuren.pdfIn PDF document text
    • http://seibyou-koujien.com/files/files/5370529773.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/ledurefitagimugu.pdfIn PDF document text
    • http://zzquansu.cn/d/files/nugixajevuluketapedebolu.pdfIn PDF document text
    • https://archielectronics.com/userfiles/files/96138277701.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613776a3bea35---nadatubupijokubodisel.pdfIn PDF document text
    • http://olympicburger1988.com/uploads/files/69531265764.pdfIn PDF document text
    • http://twilaw.com/files/files/52118945282.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://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_off0000d9c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C8 10244 bytes
SHA-256: 909627d6e7442cb50fda7f24d467c61e15fd220b2b9140f3c930baf186ede97c
font_01_sfnt_off0000f0b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B3 17844 bytes
SHA-256: 50161811ab36c67f3ac986c1e42a6aa22a5921bee76dbaf6736fdd218e56b756
font_02_sfnt_off00011ed0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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