Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfb746a55d242e79…

MALICIOUS

PDF

69.4 KB Created: 2021-04-07 19:50:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 725933a6d73e10100082c8551e3f1fa1 SHA-1: d3d755217ada70367644f23c55464c3701ec2d3c SHA-256: cfb746a55d242e795a1c0c74187e5f5d6f2c91b6d774f6ed787a3b2f323e18cb
184 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which, 'https://dafemum.ru/wix?keyword=i+am+a+pizza+lyrics+charlotte+diamond', is flagged as malicious. The document body, though heavily obfuscated, appears to be a lure related to song lyrics, suggesting a phishing or social engineering attempt. The presence of multiple links and the use of disposable hosting further support this. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://dafemum.ru/wix?keyword=i+am+a+pizza+lyrics+charlotte+diamond In PDF document text
    • https://cdn.sqhk.co/soziwariru/4Uighbr/sago_mini_space_blocks_apk.pdfIn PDF document text
    • https://lakowabanitewot.weebly.com/uploads/1/3/4/8/134898259/kefakalazisosarim.pdfIn PDF document text
    • http://damvglaz6.xyz/android_studio_free_learningb0vrp.pdfIn PDF document text
    • http://geekcods.com/29979397421eq2y0.pdfIn PDF document text
    • https://cdn.sqhk.co/pekebugus/ihcsidJ/locked_in_a_room_bristol_answers.pdfIn PDF document text
    • http://milesnires.xyz/what_is_grounded_theory_design1opwj.pdfIn PDF document text
    • https://cdn.sqhk.co/pixorikibam/jhjifjg/fireman_sam_youtube_episodes.pdfIn PDF document text
    • https://divigutokorafo.weebly.com/uploads/1/3/4/6/134683056/4255398.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://24451074-f53b-4065-993c-779ba3957988.filesusr.com/ugd/0ae25f_9f1760ed2a89445491280a25df310667.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tikofaketonub/zipunokativinujawisenum.pdfIn PDF document text
    • http://xufutat.epizy.com/62078923981.pdfIn PDF document text
    • https://60659a61-a27b-47ea-8eac-a81775c62269.filesusr.com/ugd/7a7fb1_9827fec1810446b6bf100b5a7c5eefd5.pdf?index=trueIn PDF document text
    • http://dirojuriju.epizy.com/retirement_financial_planning_spreadsheet.pdfIn PDF document text
    • http://vikudet.epizy.com/what_is_ib_tik_tok_music.pdfIn PDF document text
    • https://s3.amazonaws.com/sefipa/love_story_movie_song_mp3_download.pdfIn PDF document text
    • https://6f672a44-e16c-4921-a0f1-e3781c0647c5.filesusr.com/ugd/bda22a_dbe4d941052949d1a7cfa62354e631af.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nisiwanolom/dr_jekyll_and_mr_hyde_quotes_and_meanings.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_off0000d095.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD095 5400 bytes
SHA-256: f6705f9b4c054e0e2b7f0f4f0bd731b6fe5fa8e3dfed81ed8bde1390454c70f8
font_01_sfnt_off0000e2d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D2 11556 bytes
SHA-256: 28338d9ac6632222c6abfcda22d571e084d38fc9b8c0866ddc1a01d66a478b30

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