Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac5a87b4a1653dd0…

MALICIOUS

PDF

84.8 KB Created: 2021-03-09 08:15:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: eaedecf86e668431a95a81cdc640b64a SHA-1: 5458219be4303fb0e35f8ae2774f1afe62cd75a7 SHA-256: ac5a87b4a1653dd03b773f43679b6baa880661f3a33d7d52a72cff12221a5987
94 Risk Score

Malware Insights

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

The sample was flagged by a critical heuristic for linking to known malicious redirector infrastructure. The embedded URL 'https://dafemum.ru/123?utm_term=cid+full+episode++mp4+3gp' is the primary indicator of this malicious activity. While no scripts were explicitly extracted, the PDF structure and the presence of numerous embedded URLs suggest a phishing or redirection attempt, aligning with the Spearphishing Attachment technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 3

  • 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.
  • 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/123?utm_term=cid+full+episode++mp4+3gp In PDF document text
    • http://wogivodugakovek.mygamesonline.org/48877470583.pdfIn PDF document text
    • https://cdn.sqhk.co/josurowelimu/iiiaiOr/talking_dog_app_free_download.pdfIn PDF document text
    • http://mebets.xyz/por_que_me_crecen_las_uas_hacia_abajo05kbs.pdfIn PDF document text
    • https://cdn.sqhk.co/danajuva/dvEZMic/class_12_improvement_exam_2020_application_form.pdfIn PDF document text
    • https://cdn.sqhk.co/xidafigutoxa/BN1ejiG/airport_controller_requirements.pdfIn PDF document text
    • http://bogplaktnc.fun/gavimumetuwugogodufagzk7nz.pdfIn PDF document text
    • http://hq-cleartv.info/how_to_find_trig_values_of_anglesy1i4w.pdfIn PDF document text
    • https://cdn.sqhk.co/xewimoziwuvo/Tzhfhdh/punch_sound_effect_button.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449973/normal_601c6b5481347.pdfIn PDF document text
    • https://cdn.sqhk.co/jeporikate/hdidgcu/football_training_drills_for_9_year_olds.pdfIn PDF document text
    • http://yognat.space/6806473124840ng8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402737/normal_5fecc3ff9383b.pdfIn PDF document text
    • http://likedizar.medianewsonline.com/34957877251.pdfIn PDF document text
    • http://salizurewaki.mypressonline.com/77164053623.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://s3.amazonaws.com/badodemebo/avicularia_peru_purple_care_sheet.pdfIn PDF document text
    • http://fidikaxano.myartsonline.com/16936516621.pdfIn PDF document text
    • https://s3.amazonaws.com/bugutaj/73313473860.pdfIn PDF document text
    • https://s3.amazonaws.com/wipotegadodorek/41429046605.pdfIn PDF document text
    • https://s3.amazonaws.com/wutisigila/mr_and_mrs_brahmachari_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/purufiz/mebatobu.pdfIn PDF document text
    • https://s3.amazonaws.com/nemafu/500mb_mkv_bollywood_movies_free.pdfIn PDF document text
    • https://s3.amazonaws.com/tazopaju/37510881646.pdfIn PDF document text
    • https://s3.amazonaws.com/davubewu/matatojolapijafotupon.pdfIn PDF document text
    • https://s3.amazonaws.com/jezekemunidup/body_temperature_app_for_android.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010268.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10268 5212 bytes
SHA-256: 548f67ee26b5d07c3562d5a59bd42f8af1a573b2c7a938956f1a2352600a205e
font_01_sfnt_off00011425.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11425 10860 bytes
SHA-256: 329cbe051114bfe304f643a3261169805384e560414878bfda485341d58f3af4
font_02_sfnt_off00013947.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13947 3168 bytes
SHA-256: 63d0d750bee5ab2126a71f9502d90864b8fa6b601caf904106511b0e7bbbf524

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