Malicious PDF — malware analysis report

Static analysis result for SHA-256 14700e3666c50aae…

MALICIOUS

PDF

80.7 KB Created: 2021-05-19 13:34:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 9b4641626fb04f5676ef8ddaa5b68895 SHA-1: c4264a47053b70385db2efca7ce675e0c3f025e7 SHA-256: 14700e3666c50aae13ff0d1f0b44c7ad567c2c0de0c37ee423f81c8908950c07
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are part of an SEO link farm designed to redirect users. One prominent URL, 'https://kuzutuzo.ru/strik?utm_term=how+much+can+i+make+to+qualify+for+snap', suggests a lure related to financial assistance or benefits, a common phishing tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or a trojan downloader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • 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.
  • 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://kuzutuzo.ru/strik?utm_term=how+much+can+i+make+to+qualify+for+snap PDF link annotation
    • https://lepovomika.weebly.com/uploads/1/3/4/7/134701686/186480.pdfIn PDF document text
    • https://buzomuzugagi.weebly.com/uploads/1/3/4/3/134313884/naneme-lefebefezefumes-gowesej.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373505/normal_5fe4e7f8ede57.pdfIn PDF document text
    • https://janepowowufevi.weebly.com/uploads/1/3/4/5/134506071/1880401.pdfIn PDF document text
    • https://devumevone.weebly.com/uploads/1/3/4/5/134589636/valopuvafo_fumojexap_tamimoxiwixil_dakerepitugo.pdfIn PDF document text
    • https://fefosixofenovi.weebly.com/uploads/1/3/4/7/134755919/baroxaz_nuratifeponolaw_sefirizoretugex.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409797/normal_5fcb8f7824f5e.pdfIn PDF document text
    • https://josabinisepev.weebly.com/uploads/1/3/1/4/131452942/pawipovujusasub-nosatixizore-zobofedo-vawabiged.pdfIn PDF document text
    • https://lakofanagobogan.weebly.com/uploads/1/3/5/3/135386994/f9fedbef0e.pdfIn PDF document text
    • https://palajuwasodix.weebly.com/uploads/1/3/2/8/132815908/131a71cf0cbda6.pdfIn PDF document text
    • https://sukizasatesez.weebly.com/uploads/1/3/4/6/134686833/7b645ed83b3d8.pdfIn PDF document text
    • https://desakawof.weebly.com/uploads/1/3/4/7/134705456/4877014.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/radubozufiwo/baillie_gifford_co_limited_annual_report.pdfIn PDF document text
    • https://s3.amazonaws.com/pibabopuduj/acronis_2014_bootable_iso.pdfIn PDF document text
    • https://s3.amazonaws.com/kitakilesa/42584121369.pdfIn PDF document text
    • https://s3.amazonaws.com/zevutebulaworel/guwuwoka.pdfIn PDF document text
    • https://s3.amazonaws.com/xuxifuzituwu/congenital_heart_disease_guideline.pdfIn PDF document text
    • https://s3.amazonaws.com/bajapovogam/guild_wars_2_necromancer_build_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/wuzalugiseto/49806260225.pdfIn PDF document text
    • https://s3.amazonaws.com/sepovutapakogaf/17615721948.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_off0000fc02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC02 5600 bytes
SHA-256: 5995827c81d60e77776c68934a0db0e0cac672091c2357c1e8501b39947eb141
font_01_sfnt_off00010f00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F00 11208 bytes
SHA-256: b133f0803521f8195e42071a848140db62e5fd32ec4b4fd1070b102576463928