Malicious PDF — malware analysis report

Static analysis result for SHA-256 667c886030068da0…

MALICIOUS

PDF

72.3 KB Created: 2021-03-06 22:54:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d6ba60e0b521be7283d49fa9a58104cb SHA-1: 2b271cde615c251eb578b5c5a0f1bff29ac313b4 SHA-256: 667c886030068da0237d0f21cb19ae6db559b341a63bc53aab041ef7e9a29acb
156 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, identified as a link farm. The primary URL, 'https://bologen.ru/wix?keyword=merrill+middle+school+des+moines+iowa', suggests a potential SEO poisoning or phishing lure. The heuristic 'PDF_SEO_LINK_FARM' confirms the presence of numerous external links, indicating a malicious intent to redirect users. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://bologen.ru/wix?keyword=merrill+middle+school+des+moines+iowa
    • https://pibiwija.weebly.com/uploads/1/3/4/8/134896476/fa529acb7.pdf
    • https://cdn-cms.f-static.net/uploads/4420934/normal_6042e8b198661.pdf
    • https://static.s123-cdn-static.com/uploads/4455207/normal_5ffc227592b80.pdf
    • https://fivilogavizizov.weebly.com/uploads/1/3/4/4/134446089/gewajazuwodurot.pdf
    • https://viwutexotopuj.weebly.com/uploads/1/3/4/5/134522905/mibuxirixomiredox.pdf
    • https://sobemifukoku.weebly.com/uploads/1/3/4/8/134887972/dobus_tuwod.pdf
    • https://static.s123-cdn-static.com/uploads/4368228/normal_5fc90ef8604c6.pdf
    • https://fogasofimoxor.weebly.com/uploads/1/3/1/0/131071298/juxulusifakupedam.pdf
    • https://miwevedadig.weebly.com/uploads/1/3/1/4/131437981/3571043.pdf
    • https://zipuwuxa.weebly.com/uploads/1/3/4/3/134376087/rivitunopezadog.pdf
    • https://lufuwoxataj.weebly.com/uploads/1/3/1/3/131379696/9718335.pdf
    • https://zefojakafi.weebly.com/uploads/1/3/0/7/130776787/4174949.pdf
    • https://towelekuw.weebly.com/uploads/1/3/1/4/131406253/dajawit.pdf
    • https://dolafevofi.weebly.com/uploads/1/3/5/3/135330218/1858548.pdf
    • https://static.s123-cdn-static.com/uploads/4408471/normal_5ffa6a862fb06.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://d6236f05-450e-4b96-9875-1783d83c708b.filesusr.com/ugd/912de2_335275a9a63944949346b8d57fa1fadb.pdf?index=true
    • https://a1c9bafd-2917-4c1b-b79c-a4b44a941470.filesusr.com/ugd/f0f215_f8271a100eb947afb62333cfc426dc91.pdf?index=true
    • https://fa5d8e44-005d-4c05-925d-ba60cb7f5023.filesusr.com/ugd/121e37_fbae7b53fa5e41d485470d0635f717e6.pdf?index=true
    • https://dbba0f06-1911-40f0-8c80-a2638c7f81cc.filesusr.com/ugd/b13fd1_1a09c523a631408ab8d241b05d55a269.pdf?index=true
    • https://4465b75e-e642-4f53-8c89-e22f0b9d4994.filesusr.com/ugd/ecd213_c319d4b7f0bf4ccbbf322672ce5e3a21.pdf?index=true
    • https://dc58184e-bbba-402a-8e08-a55d552c8f3f.filesusr.com/ugd/0ebc1f_e20cbd8d04b44994965b343cee479ef1.pdf?index=true
    • https://5f8b0e40-2141-4341-98ab-6145db4b8156.filesusr.com/ugd/2072cd_a3a3670915da4f04902d887db0e08d46.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de66.bin
ee36da3f11f1547596bd543a69a2a3e7c209f696edfdd55d2dfc1df45c440019		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE66 5276 bytes
font_01_sfnt_off0000f044.bin
84dfe3c99f8c821962a289ef1e5d586dd6e6b02b02ff39e0ab4e2be373f856c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF044 10460 bytes

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