Malicious PDF — malware analysis report

Static analysis result for SHA-256 87b9dfd18dfe66ea…

MALICIOUS

PDF

67.5 KB Created: 2021-02-14 13:17:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: d6705172e1c7c6ca1f3459c1d1ae1acd SHA-1: 55ad38b4afe254bf5a504fd255b2a963f3684ac8 SHA-256: 87b9dfd18dfe66ea7f8a17668d6687dbc191e81c96b286df0bd6467af62006e1
196 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://leonvi.ru/123?utm_term=onkyo+tx+8020+manual PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4382418/normal_5fecbe686e2c0.pdfIn PDF document text
    • http://silevovuvejojev.iblogger.org/bikozanununejewov.pdfIn PDF document text
    • http://sedovarubabozop.iblogger.org/paded.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424349/normal_5fc8d9345c802.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478422/normal_5ff198aab4e0f.pdfIn PDF document text
    • https://mijezuri.weebly.com/uploads/1/3/0/9/130969422/wewanupisopebexaz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473632/normal_5fd6737f4b299.pdfIn PDF document text
    • https://tofibuji.weebly.com/uploads/1/3/5/3/135309424/bonapek-titesurutofekes-lopogamo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408471/normal_5ffa69b23e853.pdfIn PDF document text
    • https://wiperorapaxomun.weebly.com/uploads/1/3/5/3/135323561/f006671ddfa292.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/kisimujuk/behold_the_lamb_passion_chords.pdfIn PDF document text
    • https://s3.amazonaws.com/goneduzum/formal_wear_for_wedding_receptions.pdfIn PDF document text
    • https://s3.amazonaws.com/gixawetopoli/57754494984.pdfIn PDF document text
    • http://funizenobuwuka.epizy.com/bike_racer_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/pazerogasarinu/telugu_dj_audio_songs.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_off0000cb38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB38 5284 bytes
SHA-256: 263a3a13256069d49ef0c512b0e5e0e8ee973445f6f22c4d036519428eb4aa3e
font_01_sfnt_off0000dd33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD33 10568 bytes
SHA-256: a1bbe3420be2ba9ab0af164d5c4db9ea474fcf7af217466ed7cddc76d7e4a20a