Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bc5e05323343e5a…

MALICIOUS

PDF

81.8 KB Created: 2021-03-17 14:16:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 7a2cfb81af45a40342b1104b7cabe165 SHA-1: b13722b9052d37d8d68813cf514a1a490cc93e2f SHA-256: 1bc5e05323343e5a9e03be865900d2f66cc675786b4336ffa1b7ba0d7956d364
136 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, with heuristics indicating it uses an image lure to redirect users to an external URL. The embedded URL, https://lozipotod.ru/award?keyword=basic+c+programming+tutorial+pdf, is presented as a 'basic c programming tutorial pdf' to entice clicks. No scripts were extracted, but the overall pattern suggests a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://lozipotod.ru/award?keyword=basic+c+programming+tutorial+pdf PDF link annotation
    • https://cdn.sqhk.co/govizanorev/x7WijCM/conocophillips_my_hr_express.pdfIn PDF document text
    • https://cdn.sqhk.co/lukedivibeb/2bpgfic/extreme_digital_hr.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496005/normal_600928c7e5ca4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479240/normal_602e1e53c6b79.pdfIn PDF document text
    • https://cdn.sqhk.co/moserusoba/mNPjasc/26196395864.pdfIn PDF document text
    • https://cdn.sqhk.co/mugukawi/Y4JUijk/joleniviwemaxudixasiwepef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479235/normal_602406a9a96f8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b50b3d4b-db53-4a38-9948-76d308a7073f/how_much_is_thinkorswim_platform.pdfIn PDF document text
    • https://s3.amazonaws.com/baxadelefofibuz/bizek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1464344a-9b14-4c5a-90bc-322104fa0f10/82741234994.pdfIn PDF document text
    • https://s3.amazonaws.com/fatisake/wugugisiva.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e76a1191-1335-4ea5-8f97-b9bb5d4d274d/can_i_take_my_permit_test_online_in_arkansas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1fb9c82-84c1-4904-99be-55964eb381c5/playstation_gold_headset_charging.pdfIn PDF document text
    • https://s3.amazonaws.com/palikuvexake/13888034800.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65be66fc-049a-4465-a328-c17a6f18004a/how_far_is_japan_from_australia_by_plane.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17069f83-35a1-4902-b5b6-7cd8bff7f190/97497160625.pdfIn PDF document text
    • https://s3.amazonaws.com/feseni/hungry_dragon_mod_apk_1._11.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5f2fc23-dad0-4b78-97be-5ec011be63fd/childrens_bible_story_videos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0dd4aeb2-b253-47a0-9efb-57a6a39ce726/17488730539.pdfIn PDF document text
    • https://s3.amazonaws.com/lurutopobi/bikas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e600f817-d35f-417b-8c61-df4a6b3c2f1b/popular_visual_culture.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92cb7218-d3fb-445b-8b0a-d192b9709ae9/37956352984.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_off0000ff86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF86 5524 bytes
SHA-256: ea0ab56c301cc735694a43d113e94cecc43952a950431410efc6f6c09370b3c0
font_01_sfnt_off00011239.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11239 11692 bytes
SHA-256: 42dc41b4eb230e21fd56fcb7b404a14dc74500bec4509d353fb39eabe83c2d44