Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a79d68def1fee74…

MALICIOUS

PDF

70.0 KB Created: 2021-03-28 12:51:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 57fb8fb4617f0820664d71eca657ed9f SHA-1: a478c872df810ea2763fb5868a70fb7acfc11f11 SHA-256: 0a79d68def1fee7460ed659b23d9fa5ee0f7ebdbc67fe37e89599724ba1a07d3
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file is classified as malicious by a machine learning model and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many of which appear to be part of an SEO link farm designed to redirect users to potentially harmful content. The primary lure suggests a "skills worksheet" to entice clicks on a suspicious URL.

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://baarspo.ru/wix?keyword=skills+worksheet+science+skills+interpreting+diagrams+answer+key PDF link annotation
    • https://cdn.sqhk.co/xijogedobu/ffnwlOG/free_music_download_app_unlimited_songs.pdfIn PDF document text
    • https://cdn.sqhk.co/xetokive/Lw5whdG/96338745450.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390638/normal_5feb19e38376c.pdfIn PDF document text
    • https://cdn.sqhk.co/kivipemo/igjogi7/nixotaxap.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406482/normal_603f8f4819464.pdfIn PDF document text
    • https://cdn.sqhk.co/laxefotogulo/0RhaheJ/blood_pressure_define_medical.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://bulijisir.rf.gd/fexinerar.pdfIn PDF document text
    • https://s3.amazonaws.com/wupuxus/the_distance_between_us_kasie_west_sequel.pdfIn PDF document text
    • https://s3.amazonaws.com/begijufadi/sennheiser_rs120_ii_wireless_headphones.pdfIn PDF document text
    • https://43466d02-873c-4564-b63c-f2f79aa6d38e.filesusr.com/ugd/fd64e8_312968acd099462a84f00abdc14d6e54.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gudukupir/16248603942.pdfIn PDF document text
    • https://s3.amazonaws.com/vovopafubipu/sample_accident_investigation_report_writing.pdfIn PDF document text
    • https://s3.amazonaws.com/wemazun/88642908993.pdfIn PDF document text
    • https://s3.amazonaws.com/gelawiweza/febogirim.pdfIn PDF document text
    • http://latowetutut.epizy.com/informant_app_iphone.pdfIn PDF document text
    • https://5db246a0-94da-4013-9f64-c970003367b9.filesusr.com/ugd/ca5179_507ca6b531eb43d3bfcc31e6ff83f926.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c80f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC80F 5636 bytes
SHA-256: 85456e259ef02a942db748ced3f277a6b4aaca5798b0cac1443231b45288ec3c
font_01_sfnt_off0000db16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB16 9724 bytes
SHA-256: 2ead4f97c162171dba0f41c10f57668e57bf69d9c60e44de910a71e564ffac94
font_02_sfnt_off0000fc3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC3F 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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