Malicious PDF — malware analysis report

Static analysis result for SHA-256 26f3923bf8b3affa…

MALICIOUS

PDF

79.8 KB Created: 2021-04-04 08:19:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2e8133b5ddec3bd2a00a715ba693b6b5 SHA-1: c5083862a850e584e1e2957c25301b70bdebc82e SHA-256: 26f3923bf8b3affa081a16944f233bfde2afab5b364627ced7ab627ed3fe5c0f
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to Weebly and other free hosting services, indicating a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or SEO manipulation. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards the distribution of further malicious content via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vediturano.weebly.com/uploads/1/3/4/8/134886327/jumuxutozixe.pdf
    • https://jawutasujo.weebly.com/uploads/1/3/0/9/130969833/3399993.pdf
    • http://bozesedixek.mywebcommunity.org/lexezojowojowapumeg.pdf
    • https://mifevulesitiz.weebly.com/uploads/1/3/5/3/135321383/giximupofiru.pdf
    • https://pegugigatusib.weebly.com/uploads/1/3/4/4/134460290/jesit.pdf
    • http://kudukudimox.sportsontheweb.net/pijisogofoziwapamubu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://feedproxy.google.com/~r/wb/ENAH/~3/bVCGPfG74RQ/wb?keyword=how%20to%20remove%20a%20faucet%20aerator%20without%20a%20wrench
    • https://e809654a-a95b-4dbc-a338-24085255a2f8.filesusr.com/ugd/1b6cec_b78443faa256479eaef253e255753d0c.pdf?index=true
    • https://uploads.strikinglycdn.com/files/08b783d0-1a94-49f1-9018-59de0e1726d2/35157674378.pdf
    • https://d56a38bf-d62e-453c-9b5b-5b2fe88aea46.filesusr.com/ugd/359e64_f098009e5e8b4aeea12ce91b52c959a0.pdf?index=true
    • https://uploads.strikinglycdn.com/files/c8681405-47a9-4894-8d31-21c70bf90f9b/can_enlisted_go_to_air_force_academy.pdf
    • https://uploads.strikinglycdn.com/files/4becc072-5fff-4d65-8a84-38742f533c57/15540367085.pdf
    • https://29aa9d28-cc9d-45fc-8d86-3718b5881c84.filesusr.com/ugd/74c34a_c1fda468cfdb4f559842b2a349446295.pdf?index=true
    • https://e72deea9-3c4d-48de-8429-d2e8e2d5d9b3.filesusr.com/ugd/68b2df_b7a98152adcc47029feb1d8a397611c1.pdf?index=true
    • https://95fbbc11-640f-4658-acdf-6e09da746871.filesusr.com/ugd/e42ee3_54f13a40d0f54d1593df7eac5f6ddfd4.pdf?index=true
    • https://uploads.strikinglycdn.com/files/67b6ea61-054f-4761-b531-ab98a497a40f/76718629989.pdf
    • https://11ca5eb4-0abe-4d5d-8073-3f36f6088e80.filesusr.com/ugd/8b62d8_d5d6046a75ae4adb8d361d480319d9c1.pdf?index=true
    • https://b4e79a3f-0083-4b26-8056-4fe87fb46dfd.filesusr.com/ugd/332c1b_13a5e98c0324410aa1f56bdd28c8b769.pdf?index=true
    • https://11fe2947-f393-4df3-905d-f9f3730e834a.filesusr.com/ugd/b1b16e_8b1a1f07d9b34237a34941b598aeabf3.pdf?index=true
    • https://f3c4034a-4a94-4c47-b6c5-0445626d7bf8.filesusr.com/ugd/655f09_8deaf14053404bba92abefbb437240a2.pdf?index=true
    • 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edc2.bin
47019d68e25c8be25f9b3078187871cd0c38dd5448b01aa37760fa61821ef69d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC2 4904 bytes
font_01_sfnt_off0000fe57.bin
dbed70bd3ec6ed251a7e73658b5f8cafea9c0bbd5ce9a37dbc286d7a9dc0e78c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE57 10988 bytes
font_02_sfnt_off000123b8.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x123B8 4324 bytes

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