Malicious PDF — malware analysis report

Static analysis result for SHA-256 7258c822f8b40edd…

MALICIOUS

PDF

75.5 KB Created: 2021-05-12 08:55:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 44969ca0f26d659ff1b729ca113661a5 SHA-1: 73dacdafc2b07c663ad32f4acf384b95dff562a2 SHA-256: 7258c822f8b40edd89c901b60746b21fa6cd84de2e14127ee4b5ad8704c8eb98
254 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are identified as redirectors or part of link farms, indicating a malicious intent to direct users to potentially harmful content. The ML classifier and ClamAV detection strongly support its malicious nature. The embedded URLs suggest an attempt to lure users through deceptive content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://yafferge.ru/strik?utm_term=what+is+year+end+closing+process In PDF document text
    • https://lutomired.weebly.com/uploads/1/3/5/3/135316507/9396646.pdfIn PDF document text
    • http://umdtheatre.ru/blockchain_and_cryptocurrency_full_coursesezqxw.pdfIn PDF document text
    • https://nivujetomut.weebly.com/uploads/1/3/4/7/134753784/kubuporanulinu.pdfIn PDF document text
    • https://narezivif.weebly.com/uploads/1/3/5/3/135307162/5368113.pdfIn PDF document text
    • http://judifino.iblogger.org/certificate_of_origin_uk.pdfIn PDF document text
    • http://fozovozazu.iblogger.org/miliwaferudakufusalit.pdfIn PDF document text
    • http://simcars.ru/what_are_the_basics_of_civil_engineeringc76rt.pdfIn PDF document text
    • https://jimilosebot.weebly.com/uploads/1/3/4/0/134096588/romavujol.pdfIn PDF document text
    • https://vitukotegow.weebly.com/uploads/1/3/0/7/130775282/xiluka_bozovej_xisivudet.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nadefivetokilak.rf.gd/97922672534.pdfIn PDF document text
    • https://s3.amazonaws.com/wobuzisibal/present_perfect_continuous_speaking_activities.pdfIn PDF document text
    • https://s3.amazonaws.com/jezekemunidup/78491438792.pdfIn PDF document text
    • http://vijatabudevibe.epizy.com/dekokudoleguraniz.pdfIn PDF document text
    • https://s3.amazonaws.com/kiremefegonar/90151312912.pdfIn PDF document text
    • https://s3.amazonaws.com/didowugorokirug/genizesel.pdfIn PDF document text
    • https://s3.amazonaws.com/dowesitobuga/68728484118.pdfIn PDF document text
    • http://xodenumaverap.epizy.com/android_version_update.pdfIn PDF document text
    • https://s3.amazonaws.com/sigobija/wanedukexopozujuvekabizo.pdfIn PDF document text
    • http://wupesebefid.epizy.com/naxiwoxeluzutupapapis.pdfIn PDF document text
    • https://s3.amazonaws.com/tawosutosuxi/honeywell_lyric_round_user_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/zakunafu/13328788826.pdfIn PDF document text
    • http://fisejotigu.epizy.com/xuxufi.pdfIn PDF document text
    • http://logasizujonasi.rf.gd/bevel_protractor_least_count.pdfIn PDF document text
    • https://s3.amazonaws.com/sumesawoxajew/bingo_blitz_app.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_off0000e6eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6EB 5452 bytes
SHA-256: 1ad2b13370304fecad94cedb46f29534a6eac2f12b17607a34a250f5badc1e8d
font_01_sfnt_off0000f984.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF984 10912 bytes
SHA-256: ba31f79c46d80bf0c0aa3e8a97382c88eb5ba603893402cd629e1d50c0b7a28d

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