Malicious PDF — malware analysis report

Static analysis result for SHA-256 220229166fb886eb…

MALICIOUS

PDF

75.0 KB Created: 2021-03-19 16:43:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 837e2c7a91e489ac1d8065b294914f01 SHA-1: 0206cbf2630ebbb05611de5aac9f5702ee10a4ba SHA-256: 220229166fb886eb5e45970d6a644ee70248f6311a7fbb7199eb16066a9d89bc
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, with at least one, 'https://resalured.ru/123?utm_term=dividing+mixed+number+fractions+worksheet', being a primary indicator of a phishing or malware distribution lure. The PDF structure and embedded links suggest it is part of a link farm designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://resalured.ru/123?utm_term=dividing+mixed+number+fractions+worksheet PDF link annotation
    • https://vobudogekatobef.weebly.com/uploads/1/3/0/8/130874620/geloz_keriredafowoj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371543/normal_60246fa22f753.pdfIn PDF document text
    • http://julasopupep.iblogger.org/42696214579.pdfIn PDF document text
    • https://gebaxugore.weebly.com/uploads/1/3/4/5/134594027/071cdfd5eb9.pdfIn PDF document text
    • http://watodakazo.22web.org/biografia_de_fernando_belaunde_terry.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411935/normal_602d2bc8bc340.pdfIn PDF document text
    • https://xivogere.weebly.com/uploads/1/3/0/9/130969247/f8dd4723339fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454807/normal_5fda2d051243f.pdfIn PDF document text
    • http://pumujavebedopa.iblogger.org/amorphous_metal_core_transformers.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494888/normal_601b8fd72a88e.pdfIn PDF document text
    • https://foxogitasi.weebly.com/uploads/1/3/2/7/132740511/40f98d1b88db51.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417312/normal_6001cc766d597.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/86cfd974-e5a3-40a6-b973-cfe9ba570e77/sabacc_rules_edge_of_the_empire.pdfIn PDF document text
    • http://gabukinof.epizy.com/28615917138.pdfIn PDF document text
    • http://zotibulavozixu.rf.gd/5730120776.pdfIn PDF document text
    • https://s3.amazonaws.com/muvojugejoxip/qiagen_cdna_synthesis_kit.pdfIn PDF document text
    • https://s3.amazonaws.com/rawesaragegugar/11030530642.pdfIn PDF document text
    • https://s3.amazonaws.com/jebokizez/wedugijaxuzerepe.pdfIn PDF document text
    • http://tilufisarulisa.rf.gd/73725565488.pdfIn PDF document text
    • http://xateguguf.epizy.com/kindle_cloud_reader_zu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e678e54-4e2a-45d8-a04b-eafa94c674ba/67964790774.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d807b68-7e57-48ce-9c3b-4859538bff38/asus_rt-ac87u_router_manual.pdfIn 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_off0000e5a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A7 5828 bytes
SHA-256: 07b34ed0b175d20cd3fe7a0d661631b3844fd3b3897492ebfa67f0b29f40b34d
font_01_sfnt_off0000f974.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF974 10788 bytes
SHA-256: 52837a667c60dc5c2e51bc7aab1f5bd880fe0f176b1183e6300ea22d9ef42a74

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