Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4da24122b2c777b…

MALICIOUS

PDF

69.7 KB Created: 2021-03-25 00:09:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: d289bc897e63f89a6e7fa56a218097c7 SHA-1: 219e90018ec7ba5238c231589a1c0ae07186725d SHA-256: d4da24122b2c777b14b318ef8d5aaae423c513308b31a5259276b64af53d11e0
254 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple embedded URLs, with a critical heuristic firing indicating it links to known malicious redirector infrastructure. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, appears to contain text related to the lure, and the presence of numerous external PDF links suggests an attempt to direct users to potentially harmful content.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://dafemum.ru/strik?utm_term=how+to+turn+on+xp+pen+stylus In PDF document text
    • https://cdn-cms.f-static.net/uploads/4389804/normal_5fd6c2852fd09.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402717/normal_5fdd88faebdac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384296/normal_603b44a1237fb.pdfIn PDF document text
    • https://zajevikafe.weebly.com/uploads/1/3/5/2/135297545/zilib.pdfIn PDF document text
    • http://legendbilisim.com/vuteraro98j4.pdfIn PDF document text
    • https://fotawadibegul.weebly.com/uploads/1/3/1/1/131163643/209061.pdfIn PDF document text
    • http://belkwigs.com/midigumusazodoxuboxajamepmg19e.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/navoburarovada/waterpik_black_cordless_plus_water_flosser_wp-462uk_boots.pdfIn PDF document text
    • https://s3.amazonaws.com/dosipive/sulizisirirofunakaba.pdfIn PDF document text
    • http://rovizomaguwex.atwebpages.com/samuzubafuxifapevedop.pdfIn PDF document text
    • http://mifofoxidil.onlinewebshop.net/bioinformatics_algorithms_an_active_learning_approach_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/visagogijulep/luxusumukigif.pdfIn PDF document text
    • https://s3.amazonaws.com/dopugaxelelema/xitavevekibobek.pdfIn PDF document text
    • https://s3.amazonaws.com/mafavuzenoliki/bangla_english_calendar_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/vukujidor/how_to_enlarge_by_scale_factor_1_2.pdfIn PDF document text
    • https://s3.amazonaws.com/wupixufekijax/sewobokinugut.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_off0000d697.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD697 4824 bytes
SHA-256: 56e4861e2417f039a6ec9b43f948c7215da95d00318d45ef1fbd565646598dfc
font_01_sfnt_off0000e727.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE727 10272 bytes
SHA-256: 8b2f314ad33f485e166b1b2171180fc6999cc781247f621e667035dfac0d709f

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