Malicious PDF — malware analysis report

Static analysis result for SHA-256 48eab4e8f7b09c0a…

MALICIOUS

PDF

96.9 KB Created: 2021-03-28 13:37:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e086bed8679a1a9d721e08c4dbdc0a9f SHA-1: 77de4247d24bbb986e9f24d1dea7780b579f4c35 SHA-256: 48eab4e8f7b09c0ac392b4d630943b3f2dab2624fa098a91dcd4f80ef155adb2
166 Risk Score

Malware Insights

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

The PDF contains multiple heuristically identified malicious and disposable links, with one link specifically flagged as a random URL. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://pelibifir.ru/strik?utm_term=kingdom+come+baptism+of+fire+deal+with+archers
    • http://form-lnstagramcopyrightservice.com/51356115798ldsl9.pdf
    • https://cdn-cms.f-static.net/uploads/4383160/normal_601bb34ad6943.pdf
    • http://bigmagazin.xyz/juwijevifotevikidatabaw09b2d.pdf
    • https://cdn-cms.f-static.net/uploads/4393016/normal_5fd1dde3deb10.pdf
    • http://sweetygirl.club/18209765241bv3mi.pdf
    • http://bachanalytics.com/40403821658nmsez.pdf
    • http://privateguardingserviceagainstdanger.site/et91f.pdf
    • http://5coupon.info/wivirgc1yd.pdf
    • http://pifedalune.medianewsonline.com/encapsulation_process.pdf
    • https://static.s123-cdn-static.com/uploads/4413368/normal_5ff46d106b063.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://bakakixutuv.myartsonline.com/free_archeology_books.pdf
    • https://uploads.strikinglycdn.com/files/24bee1be-ad61-4b93-a7bb-41cf6a53d9ab/zuvenavabaxajopobadeduk.pdf
    • http://giduzorim.epizy.com/94600703394.pdf
    • http://mapiwenasadig.rf.gd/nes_emulator_games_android.pdf
    • http://luzasuzudi.rf.gd/all_in_one_er_apk_old_version.pdf
    • http://bitines.myartsonline.com/77921163280.pdf
    • http://zowolowoziru.rf.gd/guide_de_conversation_anglais_franais.pdf
    • https://uploads.strikinglycdn.com/files/6b43078b-2559-4bd0-b9db-dd5378e65ba1/60786668522.pdf
    • https://uploads.strikinglycdn.com/files/c88b11b0-5a87-4b2e-be38-3e8074813ff6/what_is_iso_9001_all_about.pdf
    • https://uploads.strikinglycdn.com/files/d2555ce7-d606-4e92-bbe8-32424ba4476c/wetomodutokobibinatolobab.pdf
    • http://xitufadaxavak.epizy.com/anabolismo_autotrofo.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011c58.bin
a34572213532a86f9ffff75248b56efc495ddc3b2c2cc76bb253de97b1b8c057		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C58 5768 bytes
font_01_sfnt_off00012fea.bin
a57a5fbfab8d12d256914322bb7827473b7e78de595a192f3c10bb51599812cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12FEA 11160 bytes
font_02_sfnt_off00015606.bin
15a0a8c6149de0b23a7530d0bff73a2f8b60fa5f42afc75673e27079662f2b05		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15606 18704 bytes

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