Malicious PDF — malware analysis report

Static analysis result for SHA-256 90655189f8ae74e1…

MALICIOUS

PDF

121.0 KB Created: 2021-04-06 07:50:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: ce35375383f4695e9582f6680f820cd2 SHA-1: 0810922742cb38337c4ab5f9c4c76d0c8ee71f3c SHA-256: 90655189f8ae74e13b1f0d2b1f866220f78f0719dd5dbf34ce5ddd7004dc6dfa
196 Risk Score

Malware Insights

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

The PDF contains a mass external link farm and an SEO redirector, indicating a phishing or malware distribution attempt. The primary redirector URL is 'https://baarspo.ru/strik?utm_term=doctor+zhivago+novel+review', which likely leads to a malicious payload or phishing page. ClamAV and ML classifiers also flagged this PDF as malicious, supporting the phishing and trojan classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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=doctor+zhivago+novel+review PDF link annotation
    • http://lalat.space/jaxebiwidi2a66q.pdfIn PDF document text
    • http://lynciguest.com/beyblade_v_force_episode_guiden47xi.pdfIn PDF document text
    • http://xemizawufogutuf.scienceontheweb.net/lonumipawakutum.pdfIn PDF document text
    • http://gelchlen.fun/mopopokedutimetupibnxef.pdfIn PDF document text
    • http://likelid.xyz/453893385977msa4.pdfIn PDF document text
    • http://vittorguxx.site/lulemamasebejogajulebeg9x01i.pdfIn PDF document text
    • http://tagaporigowekis.mygamesonline.org/94897846156.pdfIn PDF document text
    • http://riragukigud.scienceontheweb.net/carnival_sunrise_deck_plan.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
    • https://2c9641c8-5874-4869-9b94-f1378e60aa6b.filesusr.com/ugd/efc1f6_b64c496886ba4b8384c3ad9e60f0d5aa.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rozebofukixus/proyecto_de_investigacion_pasos_y_ejemplos.pdfIn PDF document text
    • https://3e1ae61b-6b68-46dc-8a90-d1c7a5b9f91c.filesusr.com/ugd/b8bbd7_b4076aa2ed1c4d099fa38a5d37d740fb.pdf?index=trueIn PDF document text
    • https://8eeb1f0a-0cdd-4c66-98a4-83777b49fb54.filesusr.com/ugd/64f9d2_5ed613a048d44f7485e9e827cd0b8f4d.pdf?index=trueIn PDF document text
    • http://tiluxusimutine.atwebpages.com/corneal_refractive_surgery.pdfIn PDF document text
    • https://s3.amazonaws.com/tigewibejageju/totaboduzitasuxesono.pdfIn PDF document text
    • https://s3.amazonaws.com/jebokizez/personal_goals_template_word.pdfIn PDF document text
    • https://08b4a39d-fa16-4eaa-91be-ae90003cacb9.filesusr.com/ugd/237bf7_ef3fd66d0236403ca7bdd05e3cdbc7d9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xapota/how_to_get_better_audio_on_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/nedijowewoded/granny_smith_apk_revdl.pdfIn PDF document text
    • https://s3.amazonaws.com/duzexefemosaxe/wordpress_themes_for_business_services.pdfIn PDF document text
    • https://76c9fb28-c10e-4950-85be-37de24a2ede8.filesusr.com/ugd/fa32a6_45910016900743368f5f1aa216f11778.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vuxagixil/52841924462.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000172b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x172B3 5048 bytes
SHA-256: ff03856b15907aaa892103cdba101df05a4aa15a4a3acacb8089e3ab2d183c1d
font_01_sfnt_off0001841f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1841F 4872 bytes
SHA-256: 83db6f0b85b1b3679887d353cc9edd9344f1a9394493a1b9bdf8036ce79fd01a
font_02_sfnt_off000194bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x194BD 16628 bytes
SHA-256: 037d444fa0a1dfbb887a311dcca2a27fc1e24b13fd2ea8be6ebafbcd4c3d5448
font_03_sfnt_off0001c776.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C776 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361