Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2d8a5eb080202b1…

MALICIOUS

PDF

93.8 KB Created: 2021-03-25 03:38:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 89d107ba6973eb07e966cc2128ec37a8 SHA-1: 5ac0e63f8a1406b0acb37cc825aa4c3ffbedab31 SHA-256: d2d8a5eb080202b12add19039d68878be1c4508a55bf320a5e744d921ead3e16
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 flagged by multiple heuristics, including ML and ClamAV, indicating malicious content. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains metadata related to wkhtmltopdf and a date, but no clear textual lure. The presence of external URIs and link farm heuristics strongly suggests the intent is to redirect the user to malicious sites.

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://gimoguvi.ru/aws?utm_term=the+secret+life+of+pets+cast+hawk PDF link annotation
    • http://kidupat.getenjoyment.net/29772545108.pdfIn PDF document text
    • http://fasadi.site/stihl_fs_46_trimmer_reviewscrmn6.pdfIn PDF document text
    • http://lupelisizi.medianewsonline.com/mimirasu.pdfIn PDF document text
    • http://weinmvc.net/kifesapudixelo055c1.pdfIn PDF document text
    • http://blockhcain.host/cut_paste_photo_seamless_edit_pro_apk_downloadggg4m.pdfIn PDF document text
    • http://prizinsta365.online/costco_panasonic_phones_reviewg6g4n.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417805/normal_5fea401ad82f0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451954/normal_600220b540ca3.pdfIn PDF document text
    • http://salonly.xyz/what_is_bigger_than_ho_scalevl582.pdfIn PDF document text
    • http://mylic.ru/aisi_4130_material_data_sheetnthzs.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414500/normal_60339a88a3b03.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2efabd41-1f95-43d0-8245-5f8eb9267247.filesusr.com/ugd/2f4ddf_ba12e84f64954d948faf10b976b19e76.pdf?index=trueIn PDF document text
    • http://tiluxusimutine.atwebpages.com/bondy_and_murty_graph_theory_solutions.pdfIn PDF document text
    • http://zevusup.atwebpages.com/surah_mulk_text_in_arabic.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21e0d840-3246-4c78-bb06-5eeb0230095d/jvc_rx_6000v_specs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0170f591-61bf-405b-82ca-2767d98bec8b/kotolivabukejo.pdfIn PDF document text
    • https://f495c71d-628d-4070-9a3d-b699cbb46ba4.filesusr.com/ugd/d99ef3_57c5e09d95814198bc386ca3a3905a4f.pdf?index=trueIn 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_off00013054.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13054 5208 bytes
SHA-256: 3326d5b2b4b492d901dcc3825b400d72125bba18d7d949ee4e98ae7c69ae72f2
font_01_sfnt_off0001421b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1421B 11924 bytes
SHA-256: 038b182c90f4e4bf05c63aab5a817db6cc941c964787e9587751b82d13614271

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