Malicious PDF — malware analysis report

Static analysis result for SHA-256 be08d8976e9d723c…

MALICIOUS

PDF

66.3 KB Created: 2021-02-21 17:49:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 12b1940ecb89fba1f8a1bc8bc48ff6a6 SHA-1: 6d3d5ecae19770b5e9be4e22249e554385ad7bde SHA-256: be08d8976e9d723c1a20e46ad07c9c96ce9fd6466cbf6cfe827512eba956c8f9
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting, and is detected as a phishing trojan by ClamAV. The document body, though heavily obfuscated, suggests a lure related to a specific textbook manual, aiming to redirect users to malicious sites. The presence of numerous external URIs and the ML classifier's high confidence score indicate a malicious intent to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://crophysi.ru/wix?keyword=james+stewart+precalculus+7th+edition+solution+manual+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4415950/normal_5fd90cf2e92b5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472776/normal_5fcbd7ed9fd7e.pdfIn PDF document text
    • http://odebayitrafikhizmeti.com/stanley_wet_dry_vac_bag_installation53rcu.pdfIn PDF document text
    • http://islemleriniz.org/89329736414lglns.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386089/normal_5ff0416b32795.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460076/normal_6009f13ce23a2.pdfIn PDF document text
    • http://gomijojupi.iblogger.org/23756556828.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452850/normal_600dc7b09f0a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369766/normal_5fd10cbc292f3.pdfIn PDF document text
    • https://tezolusubugejel.weebly.com/uploads/1/3/5/3/135314563/vebobukajufurafened.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412387/normal_6011298bdf25c.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/bivanud/rufuzi.pdfIn PDF document text
    • http://timavutiziv.epizy.com/amablesser_cover_song.pdfIn PDF document text
    • http://xidapevow.epizy.com/work_in_the_21st_century_5th_edition.pdfIn PDF document text
    • http://minirulo.epizy.com/collection_letter_template_medical.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_off0000c75f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC75F 5556 bytes
SHA-256: 37648f7cd161d9aa535aacd9418a6f6016b2f32dfc4e067bcbcdd542165b7612
font_01_sfnt_off0000da36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA36 9732 bytes
SHA-256: 90724ebc5917829e879fd185f0fd2e97de3a210435fc51dfd431a0beddd56d1c

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