Malicious PDF — malware analysis report

Static analysis result for SHA-256 68c3cb73e8db1d50…

MALICIOUS

PDF

78.9 KB Created: 2021-03-15 03:49:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 5125f15c8555138d456a4026907c2025 SHA-1: d825ff80601b30e62557cccadc4c9ac706c3730e SHA-256: 68c3cb73e8db1d504c2fceba7ff4c15b9652c768ab80e381518f6dd5cba41872
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, with a high-confidence heuristic identifying it as part of an SEO link farm and a lure for free downloads, indicating a phishing or malware distribution attempt. The primary malicious URL identified is https://jacksth.ru/wix?keyword=jay+cutler+back+workout+2009, which is also flagged as a redirector. ClamAV also detected this file as Pdf.Phishing.Trojan.

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
  • 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://jacksth.ru/wix?keyword=jay+cutler+back+workout+2009 PDF link annotation
    • http://damvglaz1.xyz/lista_de_todos_los_acordes_de_pianotkp88.pdfIn PDF document text
    • http://mopexaxurip.getenjoyment.net/repeluxele.pdfIn PDF document text
    • https://kepiloxuxamife.weebly.com/uploads/1/3/0/7/130740378/804918ef.pdfIn PDF document text
    • http://vuvuga.xyz/84384243372hy5fe.pdfIn PDF document text
    • https://kevavabine.weebly.com/uploads/1/3/1/4/131406582/zixomodenogorim.pdfIn PDF document text
    • http://patajafurep.mywebcommunity.org/what_is_my_zodiac_sign_according_to_vedic_astrology.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/satuja/sivepugelotisiv.pdfIn PDF document text
    • https://s3.amazonaws.com/paropabaru/mupupuvizaki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0a38529-ac68-45aa-b3aa-ec9d04e1e17b/kenmore_microwave_oven_over_the_range.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91c8417a-096b-4db4-9ac2-4c01653c5b7f/sujizojelafunasusuna.pdfIn PDF document text
    • https://s3.amazonaws.com/jazuravazaguz/92850298115.pdfIn PDF document text
    • https://s3.amazonaws.com/bomifabipi/bandhan_kannada_film_song.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00cc57b2-a663-42e4-bd06-e74d62828677/doctor_sleep_directors_cut_better.pdfIn PDF document text
    • https://s3.amazonaws.com/sazomo/vofebaruz.pdfIn PDF document text
    • https://s3.amazonaws.com/fasomusogapovi/free_worksheets_adding_with_regrouping.pdfIn PDF document text
    • https://s3.amazonaws.com/tamovagag/59916267286.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e75c749d-0281-4d74-9ddf-c9e331ccb5be/plato_meno_grube.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_off0000f3ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AE 5432 bytes
SHA-256: 844265fb8bb69bf8b4f1e28e5540203b96039bf52485b2c5ed658ba3b0bd2b9c
font_01_sfnt_off00010657.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10657 11468 bytes
SHA-256: af0329a2607fd64ed0a60c5e42798cc70fd505b4f72aacc8d8260cc08a9905ba

Open this report in the interactive analyzer, or submit your own file for analysis.