Malicious PDF — malware analysis report

Static analysis result for SHA-256 74e50fc2fb616011…

MALICIOUS

PDF

74.2 KB Created: 2021-03-14 07:38:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 42a0adb68d6f5e77fc411beab9d60626 SHA-1: b618d082e3695ab5b94709bff4e7497fd6b5e09e SHA-256: 74e50fc2fb616011380ac2f73ddefc87481f79bfe91b3ab7612e2bbe417314dd
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, and employs SEO-like keywords in the URLs to attract victims searching for homework answers. The document body is heavily obfuscated, but the presence of external links and the heuristic firings strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jottigo.ru/wix?keyword=chapter+7+homework+answers PDF link annotation
    • http://tapagigozi.medianewsonline.com/contemporary_virtue_ethics.pdfIn PDF document text
    • http://reduslim-shop.site/22334854585pos7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367687/normal_5fe00cc4075dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416322/normal_603e6e4f56c20.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485939/normal_5fec161fce5be.pdfIn PDF document text
    • https://cdn.sqhk.co/wofunukasu/g8KsheX/afms_full_form_in_hvac.pdfIn PDF document text
    • http://dalosizofovabes.medianewsonline.com/gojavikepis.pdfIn PDF document text
    • http://instapriz.site/leonardo_dicaprio_girlfriends_guideccr9x.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419430/normal_6023c5ff5cf87.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405903/normal_5fe78f83bea1f.pdfIn PDF document text
    • https://cdn.sqhk.co/xoxapivasif/Oibhy5a/space_shooter_galaxy_attack_mega_mod_apk.pdfIn PDF document text
    • http://realwockyc.info/lagu_jambi_pendayung_patahe7wqd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367632/normal_604bc11a8ac15.pdfIn PDF document text
    • http://good-production16.site/14341264144s31sv.pdfIn PDF document text
    • http://wordsideget.top/394263151753r6c6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://fc06435f-e709-4c80-b59d-96fa470c1a13.filesusr.com/ugd/bdc04d_f2cdfebc16514454b5838c76418074cd.pdf?index=trueIn PDF document text
    • https://37523d11-79cf-4eb3-ada4-f05de57c71ee.filesusr.com/ugd/275374_b2321f3744e640f68c5b167308ee8b27.pdf?index=trueIn PDF document text
    • https://e1cf253b-b3af-4135-a675-1c3c021177f9.filesusr.com/ugd/111c46_e6db735ece794c40b643e77578275859.pdf?index=trueIn PDF document text
    • https://9d3edb37-11ce-4d87-b861-4f8d850d55a0.filesusr.com/ugd/0d2aa0_461f0be6f459478897c30354165c7c5f.pdf?index=trueIn PDF document text
    • https://ac685e6e-6442-44c0-91a1-b3a367e79ef2.filesusr.com/ugd/ce77c6_3cbfc4641a9e4b98a2a7508d3e09f347.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e58a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE58A 5168 bytes
SHA-256: aeefc9dec45ac861917bf2bb81972d6245b6b8572dc636b5df7b8aea0035f49d
font_01_sfnt_off0000f703.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF703 10720 bytes
SHA-256: 54a7d8c48ef8eb138e4e53df328995a772990f048630b31ca535610ef9e6d509

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