Malicious PDF — malware analysis report

Static analysis result for SHA-256 911838dde0a3ab62…

MALICIOUS

PDF

85.1 KB Created: 2021-03-27 23:54:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 2ecfe15f4cf1e301bb59fbc5c536890d SHA-1: adbecf22a508699d40342846fc2794b15c71b253 SHA-256: 911838dde0a3ab6269acf424ddd3e96713aa856a787aa233fb6355a544289f37
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm for phishing or malware distribution. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate a large number of outbound links designed to appear as search results. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or delivering a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://jottigo.ru/wix?keyword=everfi+financial+literacy+module+5+answers PDF link annotation
    • https://zulezinema.weebly.com/uploads/1/3/0/7/130776370/fesetaduzij.pdfIn PDF document text
    • https://pikivazok.weebly.com/uploads/1/3/0/8/130873779/7721694.pdfIn PDF document text
    • https://cdn.sqhk.co/tinupolureg/vhbavhj/21762501510.pdfIn PDF document text
    • https://cdn.sqhk.co/dubeminap/haizAjf/twitter_logo_copy_and_paste.pdfIn PDF document text
    • https://cdn.sqhk.co/pawanipol/eeZricE/42709091204.pdfIn PDF document text
    • https://cdn.sqhk.co/wadusazilox/ggfiihs/dolphin_robot_transform_robot_wars_x.pdfIn PDF document text
    • https://nisaxiguxizi.weebly.com/uploads/1/3/5/3/135306566/7527c4e84b.pdfIn PDF document text
    • https://xidoferowugefu.weebly.com/uploads/1/3/4/3/134348033/31f70b90b.pdfIn PDF document text
    • https://fujerituzaxu.weebly.com/uploads/1/3/0/7/130775231/gabojafa_wugifikadunafaz.pdfIn PDF document text
    • https://balesiloruj.weebly.com/uploads/1/3/4/6/134671801/96266e9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/genedesowul/81494698889.pdfIn PDF document text
    • https://73f4d879-981c-49fe-abc7-520f36a14a84.filesusr.com/ugd/b77b08_ecbb3f7790f54311974c37f5b96eced2.pdf?index=trueIn PDF document text
    • https://76f5a3e5-08d8-4581-9975-6c1b933a1845.filesusr.com/ugd/dbbd16_9b2c1d1de3fd43ea9d07116d1eb3878f.pdf?index=trueIn PDF document text
    • https://61069a5e-3c5f-4884-a3c7-8c7552058b74.filesusr.com/ugd/0789d5_008743bf5f8f4714899d31d6af6d131d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tozaduliwubega/grade_10_cookery_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/nunakixuma/rulegemopawawigiruled.pdfIn PDF document text
    • https://s3.amazonaws.com/zeworibuzoza/gawufuwewewoxufaziwaf.pdfIn PDF document text
    • https://s3.amazonaws.com/xupovobejanam/nudikubafovafogigi.pdfIn PDF document text
    • https://s3.amazonaws.com/juzinaramip/jetulagutozepoguxa.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010a07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A07 5504 bytes
SHA-256: 707cf1e1ae5c50236a06f9e94fcf1dd9287024ce02ae4464c10b816fd342f8b9
font_01_sfnt_off00011ccd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CCD 12248 bytes
SHA-256: 5d649590a11b5bf997829b6ecad8291d991aa215a69e725c536d54bb57e5e5db

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