Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca757c2ddd5d566a…

MALICIOUS

PDF

72.2 KB Created: 2021-03-30 02:12:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 5d24d2fe06a62f8d61fce2832c332895 SHA-1: a42d51ac761e94e849aeee7513515aecc8aa4b3d SHA-256: ca757c2ddd5d566aed27d6a6420ba538363b9b9186f54e0255b877ee98886754
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to SEO-optimized PDF gateways, and one specific redirector URL (https://gimoguvi.ru/strik?utm_term=sennheiser+rs+170) that is flagged as a lure. ClamAV and ML classifiers also identified this PDF as malicious, likely phishing or a trojan. The presence of embedded URLs and the overall structure suggest an attempt to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gimoguvi.ru/strik?utm_term=sennheiser+rs+170 PDF link annotation
    • http://legendbilisim.com/niveles_de_prevencion_primaria_secundaria_y_terciaria_del_vihgl0ff.pdfIn PDF document text
    • http://soldatskaya6.ru/profusion_infrared_quartz_tower_heater_reviewsny3wt.pdfIn PDF document text
    • http://termometr-medikal.site/88243639420j51c3.pdfIn PDF document text
    • http://216tilford.com/how_to_unlock_frigidaire_stackable_washer90qr9.pdfIn PDF document text
    • https://pupewofitesog.weebly.com/uploads/1/3/4/7/134771191/2172837.pdfIn PDF document text
    • http://fifamarketbot.com/tozepazodltdja.pdfIn PDF document text
    • https://bajigexok.weebly.com/uploads/1/3/4/1/134131467/mivakagon.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/lezopobigeza/family_tree_maker_companion_guide_coupon.pdfIn PDF document text
    • https://s3.amazonaws.com/jevedijadiki/aruba_controller_7005_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/tozaduliwubega/324427824.pdfIn PDF document text
    • https://s3.amazonaws.com/vebenok/punjabi_bhajan_video_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/palevijuj/msi_n1996_user_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/vabedafozo/meal_planning_worksheet_printable.pdfIn PDF document text
    • https://s3.amazonaws.com/kavifunaruvi/authorisation_letter_to_act_on_behalf.pdfIn PDF document text
    • https://s3.amazonaws.com/jebupofedijakuk/uninstall_android_app_adb_shell.pdfIn PDF document text
    • https://s3.amazonaws.com/biwubeleba/irrational_numbers_worksheet_grade_8.pdfIn PDF document text
    • https://s3.amazonaws.com/zepifudoxapo/maxtor_blackarmor_manager.pdfIn PDF document text
    • https://s3.amazonaws.com/jujojomojemiz/whistle_baby_song_free.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d354.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD354 4908 bytes
SHA-256: 756bf3d785510b0069709324c1ec2be3eb7b94d0e4bb735edd04d177f9513a4e
font_01_sfnt_off0000e40c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE40C 20960 bytes
SHA-256: 6e858368efa350cc4b104efe4d5864776ec99265f8d546e9b21cf043c7c76514

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