Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f987a359941c3a1…

MALICIOUS

PDF

74.1 KB Created: 2021-02-18 12:27:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: e8dfa38995ac79437a0ed942fa83b287 SHA-1: 6efbe1c84dcca5a31d0c330b0480399f4cb7fdbd SHA-256: 7f987a359941c3a1f3604f0a8c13fcffc1fd71006288ac0d67ffd199996bde95
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, many of which point to a link farm designed for SEO purposes, suggesting a phishing or malicious redirection scheme. The presence of a URL with UTM parameters and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicate a malicious intent to trick users into visiting potentially harmful websites. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a phishing lure.

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://jottigo.ru/strik?utm_term=how+to+play+the+violin+bow+correctly PDF link annotation
    • https://fupuvoriru.weebly.com/uploads/1/3/4/4/134494751/bipimadeg_fujupin_fopunonunisi.pdfIn PDF document text
    • https://wegudogixudefup.weebly.com/uploads/1/3/1/4/131438345/memanevefoduwixip.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366959/normal_5ff7d9e3e91d5.pdfIn PDF document text
    • https://zomimodobi.weebly.com/uploads/1/3/0/7/130739583/8488298.pdfIn PDF document text
    • https://punuvenow.weebly.com/uploads/1/3/4/4/134445800/3e6a59.pdfIn PDF document text
    • https://fipoxojumudex.weebly.com/uploads/1/3/4/6/134649093/zutetapuxopenebif.pdfIn PDF document text
    • https://nelibijejukeli.weebly.com/uploads/1/3/1/4/131437261/8661521.pdfIn PDF document text
    • http://jenirafona.22web.org/blank_sheet_music_template_for_word.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/lerezazo/power_bengali_movie_hd_video_song.pdfIn PDF document text
    • https://s3.amazonaws.com/xilasisefi/colliers_boston_market_report.pdfIn PDF document text
    • http://sabukizazuse.epizy.com/aladdin_font_type.pdfIn PDF document text
    • https://s3.amazonaws.com/remuv/guided_reading_activity_8-_1_sensation_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/wizidimawag/73910931345.pdfIn PDF document text
    • https://s3.amazonaws.com/jemazejodep/50121322890.pdfIn PDF document text
    • http://siripuxem.rf.gd/athens_map.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_off0000e648.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE648 5200 bytes
SHA-256: 855c040510489d46e80a320cb79681d24ce70517c18f06b032a3d02831d13bb3
font_01_sfnt_off0000f807.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF807 10396 bytes
SHA-256: 4bdd6f816e5239706f060fb88045ba6f3174a994daf8607b7815da1b466852a7

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