Malicious PDF — malware analysis report

Static analysis result for SHA-256 e20f0a0b8cb4c4d6…

MALICIOUS

PDF

76.0 KB Created: 2021-02-20 15:53:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: b188ffb35d83cc12a0859982afd8b6c9 SHA-1: b66dce8bde2f0f5659b78ef5d8e3037d11f5d3c5 SHA-256: e20f0a0b8cb4c4d65bb0e268619cec359b3c16de8d3bb746a7ebd9a4dc9e2f4a
196 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which appear to be part of an SEO link farm designed to redirect users to potentially malicious content. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and ML classification strongly indicate malicious intent. The document body, though heavily obfuscated, contains text related to 'neuropsychological test battery' which likely serves as a lure to encourage clicks on the embedded URLs.

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/strik?utm_term=what+is+a+neuropsychological+test+battery PDF link annotation
    • https://cdn.sqhk.co/kofatuziwu/c88heha/level_201_escape_room_mystery_word.pdfIn PDF document text
    • https://cdn.sqhk.co/vilevefe/jh67hfc/vezojajexotopijomij.pdfIn PDF document text
    • http://befemoxujutebi.22web.org/best_manual_can_opener_for_arthritis.pdfIn PDF document text
    • https://cdn.sqhk.co/lowilufape/hhdhegf/59156906493.pdfIn PDF document text
    • http://usesucre.pro/the_handbook_of_fixed_income_securities_8th_editionqo8kh.pdfIn PDF document text
    • https://cdn.sqhk.co/koroxofusino/fBjdohf/taxetulovuzav.pdfIn PDF document text
    • https://cdn.sqhk.co/rerunaropiz/Tgihhia/supply_house_promo_code_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/gekobegij/ihbigcu/durojedeliwipe.pdfIn PDF document text
    • http://boost-store.net/99830544083bd9vl.pdfIn PDF document text
    • https://simebusuf.weebly.com/uploads/1/3/1/4/131406507/vutojofaredowa.pdfIn PDF document text
    • https://cdn.sqhk.co/tikugosedik/Ridibhe/unblocked_games_6969_escape_the_prison_walkthrough.pdfIn PDF document text
    • https://cdn.sqhk.co/mapetidul/gcjj7id/marshmallow_furniture_toy_story.pdfIn PDF document text
    • http://noverst.xyz/simbologia_de_soldadura_en_planos_estructuralestdswq.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000ebeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBEB 5452 bytes
SHA-256: cfd6087c9c13aaca3270a540232a35c4d44bd06161e5a72bdea819ff9b3670e8
font_01_sfnt_off0000fe80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE80 10692 bytes
SHA-256: 9d8306fdbd53a843a26bdd454b02a1615936c9c9df09c203efafd83f6c59e63f

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