Malicious PDF — malware analysis report

Static analysis result for SHA-256 e39f2319c7cf0b29…

MALICIOUS

PDF

71.4 KB Created: 2020-11-25 20:36:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: bb2a76826d7ffab8cbd289cd0d6d4190 SHA-1: 929050ad91bb91f3493f9f74baee114dd7a23c45 SHA-256: e39f2319c7cf0b29508db822900010ba5d8afc69886accd401f1c4fd4a25f55b
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a known malicious redirector. The heuristic firings indicate this is a malicious redirector and a link farm, suggesting the document's primary purpose is to lure users to malicious sites. No scripts were extracted, but the embedded links are sufficient to classify this as a phishing or malware distribution attempt.

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 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.
  • 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://ggtraff.ru/strik?utm_term=fine+by+me+andy+grammer+ukulele+chords In PDF document text
    • https://cdn-cms.f-static.net/uploads/4371004/normal_5f88f55d56715.pdfIn PDF document text
    • https://vatelepetelijul.weebly.com/uploads/1/3/4/7/134765631/fekexujow.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381738/normal_5f97ba80381d4.pdfIn PDF document text
    • https://subutadenurafo.weebly.com/uploads/1/3/4/5/134581349/golufefudo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371799/normal_5faf9e03f02dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379605/normal_5fbd8542cc8f5.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://s3.amazonaws.com/lewuli/focus_daniel_goleman_descargar_gratis.pdfIn PDF document text
    • https://s3.amazonaws.com/lopadivupudexa/mudapiwegigeke.pdfIn PDF document text
    • https://s3.amazonaws.com/kisimujuk/board_exam_date_sheet_cbse.pdfIn PDF document text
    • https://s3.amazonaws.com/pisik/lg_slider_phone_att.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f813cbb7-0d2b-4f26-b225-f18cc4a9e3b4/obs_is_already_running.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6f18b1d-4c7d-425e-b322-dd9064d1731e/5486026056.pdfIn PDF document text
    • https://s3.amazonaws.com/patotale/bacteria_and_virus_worksheet_and_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db7d32a2-fe1f-4466-9ee9-08a7e9428f0c/pogil_activities_for_ap_biology_cell_cycle_regulation_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73667a3c-5bd0-4333-a146-cb725d71bd32/38289737177.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_off0000c05a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC05A 5416 bytes
SHA-256: ceaf8e2015632af700c2bd4e37170f03d19facf1c2806dcb9f72b42491b8bb58
font_01_sfnt_off0000d287.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD287 14608 bytes
SHA-256: 77806941836a078eef01798416f85d1a4df6d10ace92ec2a1643a133b658caa0
font_02_sfnt_off000100a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A2 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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