Malicious PDF — malware analysis report

Static analysis result for SHA-256 42f6b2c6b1a01ac5…

MALICIOUS

PDF

74.4 KB Created: 2021-03-14 18:16:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: a8f6bea4a2a790c571cebe354fe11381 SHA-1: 4bce6428f7c38d4416f2f7e4c1f90d1337b790d8 SHA-256: 42f6b2c6b1a01ac5a5aa771254a685c7b4a3d09c4789b860ecc239963ec732f7
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links pointing to various domains, many of which appear to be disposable hosting. This behavior is indicative of a link farm, often used for SEO manipulation or to distribute malicious payloads. The ClamAV detection and ML classifier strongly suggest malicious intent, aligning with the PDF_SEO_LINK_FARM heuristic.

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.
  • 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://golowaki.ru/123?utm_term=infographic+powerpoint+template PDF link annotation
    • https://bimipesetasezi.weebly.com/uploads/1/3/4/0/134017520/1816749.pdfIn PDF document text
    • http://clientbluebadge.com/gutolezopa9.pdfIn PDF document text
    • http://kavelux.22web.org/how_to_identify_sugar_maple_tree_leaves.pdfIn PDF document text
    • https://cdn.sqhk.co/nemoludajedu/DYgfVjb/71798379934.pdfIn PDF document text
    • https://wovofonunubani.weebly.com/uploads/1/3/1/4/131408017/peviguwaruvezatinav.pdfIn PDF document text
    • https://fezekisovo.weebly.com/uploads/1/3/4/6/134661064/sisipesutig.pdfIn PDF document text
    • https://cdn.sqhk.co/jerivudofin/giigchd/wuwosevuzeniluvegoxivuw.pdfIn PDF document text
    • https://zipobirin.weebly.com/uploads/1/3/5/3/135386694/6463706.pdfIn PDF document text
    • http://webdefilmizle.com/why_are_mr_and_mrs_number_so_happy_wbmhbo.pdfIn PDF document text
    • https://cdn.sqhk.co/pifajaloro/3HicNhd/wedotaluwirubenudubewuwob.pdfIn PDF document text
    • https://bokesavuxi.weebly.com/uploads/1/3/0/9/130968985/1171536.pdfIn PDF document text
    • https://sikiroradimer.weebly.com/uploads/1/3/4/6/134619363/bavuvita_jonul_faribazuv.pdfIn PDF document text
    • http://newyearshop.site/black_leather_platform_ankle_bootsi0dru.pdfIn PDF document text
    • https://cdn.sqhk.co/damukowabij/9hgIggg/ben_10_wallpaper_4k_download.pdfIn PDF document text
    • https://tazuromanuzowo.weebly.com/uploads/1/3/1/6/131636862/fa181bd35.pdfIn PDF document text
    • https://bijimuxe.weebly.com/uploads/1/3/4/8/134886115/3346245.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://muburenimigalu.epizy.com/adobe_editor_cost.pdfIn PDF document text
    • http://detapir.rf.gd/download_buku_belajar_bahasa_cina.pdfIn PDF document text
    • http://fuxedozet.epizy.com/john_grisham_the_guardians_plot.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_off0000e6ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6AE 5280 bytes
SHA-256: 3423e0816bf505fd434191ac6df6176e4157ffdc608883b6d1ffa4ba4ee00765
font_01_sfnt_off0000f895.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF895 10524 bytes
SHA-256: 2b0fbbe40acac288c7697b6ee45b3caaa84b9cd442e924b646cd97dc57dfb6e0

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