Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6ec1e2d57285f6b…

MALICIOUS

PDF

77.0 KB Created: 2021-03-05 08:02:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 88ed9a671716f7abb6b11cc5111f2cba SHA-1: 6553f7b5f8ce92c5f2cf0b1106fbddea6e36dcec SHA-256: a6ec1e2d57285f6b8ff8c71861c3eba70a20fe2b8923046ae2b0a787c1a07719
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan variant. It contains a large number of external links, many hosted on disposable domains, suggesting it's part of a link farm designed to redirect users. The document body, though heavily obfuscated, appears to be a lure related to English verb conjugations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • 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.
  • 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://dugedepap.ru/wb?keyword=lista%20de%20verbos%20em%20ingles%20regulares%20e%20irregulares%20pdf PDF link annotation
    • https://jinijazi.weebly.com/uploads/1/3/4/6/134668286/mirop.pdfIn PDF document text
    • https://sojanonef.weebly.com/uploads/1/3/0/9/130969598/rejipozugufapeb.pdfIn PDF document text
    • http://javaxirivibewi.mygamesonline.org/14393366650.pdfIn PDF document text
    • https://mutefalififide.weebly.com/uploads/1/3/1/3/131383766/lerit.pdfIn PDF document text
    • https://vipukawolatu.weebly.com/uploads/1/3/4/4/134486161/selixix-gojokix-fenesud.pdfIn PDF document text
    • https://xotogifove.weebly.com/uploads/1/3/1/4/131406695/vagodikazerupi.pdfIn PDF document text
    • https://rupevegix.weebly.com/uploads/1/3/4/8/134887155/4567953.pdfIn PDF document text
    • https://sasominafa.weebly.com/uploads/1/3/4/3/134362810/pivul_mikedifad_gufev.pdfIn PDF document text
    • https://disesusobabetom.weebly.com/uploads/1/3/0/8/130814900/0f0e282c9f8bb.pdfIn PDF document text
    • http://jezugelevafebir.22web.org/cosatto_supa_stroller_manual.pdfIn PDF document text
    • https://luxituwane.weebly.com/uploads/1/3/1/8/131859527/woton.pdfIn PDF document text
    • http://tubezadobuzaro.66ghz.com/gta_5_online_clubhouse_guide.pdfIn PDF document text
    • http://fopokigife.mywebcommunity.org/26415122939.pdfIn PDF document text
    • https://kadibunafi.weebly.com/uploads/1/3/0/9/130969561/garobiraxenure-xised-wesuwobegu.pdfIn PDF document text
    • https://lixubirenolona.weebly.com/uploads/1/3/4/6/134669397/japupasotiralaronul.pdfIn PDF document text
    • https://salobomuxalevi.weebly.com/uploads/1/3/1/0/131070078/7627347.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rogofijanititad.epizy.com/kunowozaberuzulavuze.pdfIn PDF document text
    • https://75a697d3-84f0-44cf-bab9-f05e37020c50.filesusr.com/ugd/7c3584_9d488f31743a40d984df4a2e459975ea.pdf?index=trueIn PDF document text
    • http://faberaladaruz.epizy.com/equivalent_fractions_tenths_and_hundredths_worksheets.pdfIn PDF document text
    • https://69c5641f-197a-42c1-bef1-daa502c1f1d7.filesusr.com/ugd/948cea_13e3d7be99c24b198b70ef926feed163.pdf?index=trueIn PDF document text
    • http://kedisijusa.onlinewebshop.net/vokikifuvefolu.pdfIn PDF document text
    • https://d56a38bf-d62e-453c-9b5b-5b2fe88aea46.filesusr.com/ugd/359e64_324b5e4398b8445db7bd51d525bcb243.pdf?index=trueIn PDF document text
    • https://68a74d12-89ac-4a94-b826-09ad332a30bf.filesusr.com/ugd/1a0392_bef4574ef4184396bc89f22f79bc6ebf.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e417.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE417 5500 bytes
SHA-256: cbb0849194aea5a01e4b40a61d745829ca76a2e1c4724fc783a244268a455178
font_01_sfnt_off0000f6ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BA 1800 bytes
SHA-256: daad3f347a4f42f432ee9983e619a7c063e36761dba5934b469418034847e28e
font_02_sfnt_off0000ff48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF48 11420 bytes
SHA-256: e1c2d2ff451d36141cbf0abc8c48356ef8143f46d8efc6e25466d64e5264e28b

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