Malicious PDF — malware analysis report

Static analysis result for SHA-256 228fa8798061c352…

MALICIOUS

PDF

97.9 KB Created: 2021-04-01 01:09:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bd364b34d55c53721517f58e80c48197 SHA-1: 5e8ab78dd44806782d688b9666f7612bfe86ec6b SHA-256: 228fa8798061c352787cc4cfddcda21333e13e7fef677a4dbba12a3895f9c8f1
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used for SEO poisoning to drive traffic to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as phishing. The embedded URL and the PDF_SEO_LINK_FARM heuristic point to a strategy of creating a link farm to manipulate search engine results.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://seumenha.ru/wix?keyword=ancient+greece+map+worksheet
    • https://cdn.sqhk.co/mipijotom/hTshKie/setadoxolobilikazabu.pdf
    • https://cdn-cms.f-static.net/uploads/4458840/normal_60501b01d6cd6.pdf
    • https://cdn.sqhk.co/wugotiparo/hfjisii/26210568069.pdf
    • https://cdn-cms.f-static.net/uploads/4366382/normal_6041ae7952d16.pdf
    • https://cdn-cms.f-static.net/uploads/4366956/normal_603a911f84b9c.pdf
    • https://cdn.sqhk.co/boremagu/8gjihpy/46139500583.pdf
    • https://cdn.sqhk.co/lerutefo/WFS5jgH/57322395678.pdf
    • https://cdn-cms.f-static.net/uploads/4473044/normal_6035716b30f89.pdf
    • https://cdn.sqhk.co/mazonixun/jbhj3uX/shoot_the_apple_unblocked_66.pdf
    • https://cdn.sqhk.co/pajubopolak/tKibhi1/94591357705.pdf
    • https://static.s123-cdn-static.com/uploads/4403263/normal_5fc9686042bb4.pdf
    • https://cdn.sqhk.co/nuzozuni/fPB7O6M/3333028284.pdf
    • https://cdn-cms.f-static.net/uploads/4479715/normal_60260b520d509.pdf
    • https://cdn.sqhk.co/zezinojox/KBVhajg/my_talking_tom_2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://8c17aa34-c454-4d6c-a218-8929c845e329.filesusr.com/ugd/808cd0_f5b5f9e57a464d7894719ef3a5da0632.pdf?index=true
    • https://1ec9b6e7-17eb-4e1e-a994-ba5ce4cbdb7c.filesusr.com/ugd/d4a9d6_c53740537cc644e9aeeee23eaad6e7f1.pdf?index=true
    • https://78a3f932-2eca-4366-91b9-d52a2f3c5f58.filesusr.com/ugd/a586f9_e7a8a920abf04dbd933b0c1adffcb00e.pdf?index=true
    • https://c0b8f06b-4e98-4d3d-89ef-2f08caba629a.filesusr.com/ugd/0c8cc8_6b14215545f14faf97c92819a0122d44.pdf?index=true
    • https://6f2fb29c-15f2-4b08-b525-3eb91a7f0a41.filesusr.com/ugd/c3548c_e5dc159a8c24489dba2fe9116c49de6b.pdf?index=true
    • https://1237a3da-0b33-4890-9ba9-974507bf2590.filesusr.com/ugd/3e0cb9_f1c8594ad21d4117bd245c045c985301.pdf?index=true
    • https://b133b025-67d1-4190-9e53-fbb99503dec2.filesusr.com/ugd/caf13f_50831f5a7e5041338d446628acfb7732.pdf?index=true
    • https://e905a76e-7bc1-418c-be29-e8eda1603e86.filesusr.com/ugd/3fb32a_bfd9b42cb21640ada17abb69fc9431f6.pdf?index=true
    • https://7ae52be2-ba3c-41fb-8935-29281088223e.filesusr.com/ugd/affaa6_f323b769d26c455889d1102ef006c628.pdf?index=true
    • https://4cd5a77a-be8d-44ba-8952-4177873115c4.filesusr.com/ugd/930050_5cad1d46b1f041e08ae7a123d1ecaa5c.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_off00013994.bin
4aba2bb845853324476be69e5ed1bf4ff35002942389efac2b843cac1129f0e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13994 2828 bytes
font_01_sfnt_off0001438f.bin
b8634105db3710741c755cd05e7372a7f31c797f52f7eb93d715892ff6cac3f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1438F 5460 bytes
font_02_sfnt_off0001560d.bin
9d5916c725496c5b19a3e2f00c2ce535d5cc100c972d380fa4b5ffeed23f54d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1560D 10064 bytes

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