Malicious PDF — malware analysis report

Static analysis result for SHA-256 9282382ebe39fbfd…

MALICIOUS

PDF

75.3 KB Created: 2021-03-09 11:54:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: e8c63c3281acecbcec221e30fa7d24c4 SHA-1: 3262e2524694c605e4890e44115b92e1b8729300 SHA-256: 9282382ebe39fbfd04c21d59b6238e163a970eb8b786e3aa95712e32184d98ea
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one prominent URL pointing to 'baarspo.ru', suggesting a phishing or malware distribution lure. The document body, though partially corrupted, contains text related to operating systems, likely a pretext to entice users to click the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/aws?utm_term=tipos+de+sistema+operativo+en+una+computadora PDF link annotation
    • http://ziwixan.iblogger.org/baiju_bawra_1952_full_movie_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390684/normal_603f320ab4362.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470985/normal_5fe4d84670fe0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391335/normal_604395347b234.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://guxajez.rf.gd/table_of_standard_integrals.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6fe8ece8-8b95-4aaa-a3e5-505519070720/cloud_security_engineer_remote_jobs.pdfIn PDF document text
    • http://nomapalugaji.epizy.com/google_camera_apk_xiaomi_mi_9t.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9c1932e-a4cd-4dc5-bfa6-1a4cd0483e84/kenmore_sewing_machine_158.480_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/jepavilutabilel/ubuntu_desktop_16._04_32_bit_iso.pdfIn PDF document text
    • http://mujunuge.rf.gd/venue_report_seattle.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee0b38c0-c8ec-4245-8514-073687c70b96/pibilidokanexuniwageb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52168f65-8eb9-4967-ac41-6ea65fed090f/wusuxedowe.pdfIn PDF document text
    • https://s3.amazonaws.com/kubafezin/cf_auto_root_sm-_j100h.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32c530d7-6cb5-4e8f-8e49-4aa1cd0451e6/concepto_de_investigacion_cualitativa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/869b7db9-678c-4de2-99ae-bf2aef777930/who_judges_first_in_cards_against_humanity.pdfIn PDF document text
    • http://pofomabagemekut.epizy.com/48591173216.pdfIn PDF document text
    • http://tagedimevoxi.rf.gd/wajinot.pdfIn PDF document text
    • http://mibarup.epizy.com/cannon_american_eagle_24_gun_safe_review.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_off0000e7ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7AE 5196 bytes
SHA-256: 50d97cc0c75c8799f305899fbef711b75012d130e9b327348bf2a3dd89825170
font_01_sfnt_off0000f946.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF946 11248 bytes
SHA-256: 5eb7f1a58793bb6f363a4c226f7fe68669471eeb810cd00ccf484f68016a772b

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