Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b25846adb015189…

MALICIOUS

PDF

77.6 KB Created: 2021-05-02 18:31:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: b07a7feeaa08276323b6b3986ae7b2b7 SHA-1: 2d3f0a1a237ec050556d003d580fbec3f3310050 SHA-256: 3b25846adb015189c72042e3cf9bd729b394f2b937733345d5459ed330366a71
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The document body, though heavily obfuscated, suggests a lure related to a 'software engineering theory and practice 4th edition solution manual pdf', indicating a phishing or scam attempt. The presence of external URIs and link farm heuristics further supports a malicious intent 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://seumenha.ru/strik?utm_term=software+engineering+theory+and+practice+4th+edition+solution+manual+pdf PDF link annotation
    • https://cdn.sqhk.co/kuwusemob/ChJqhfz/maxeruzigijuk.pdfIn PDF document text
    • https://dowamodugepaxa.weebly.com/uploads/1/3/0/7/130739159/7545412.pdfIn PDF document text
    • http://padojobimo.mywebcommunity.org/zifikolezuzizewusa.pdfIn PDF document text
    • http://lenusabipowezo.getenjoyment.net/sezotosogazekoma.pdfIn PDF document text
    • http://viruxego.mygamesonline.org/math_book_download.pdfIn PDF document text
    • http://kanudivuvim.iblogger.org/somekejuliwokunovare.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474205/normal_6040fe39e33b2.pdfIn PDF document text
    • https://mazazujusuvazix.weebly.com/uploads/1/3/1/8/131856432/nanapejosu.pdfIn PDF document text
    • http://dotavulilego.mypressonline.com/dunasojugulabinizutu.pdfIn PDF document text
    • https://watibovogop.weebly.com/uploads/1/3/4/8/134876481/pujolidavetofukifama.pdfIn PDF document text
    • https://xitupiwe.weebly.com/uploads/1/3/4/4/134489196/49ec12e1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379379/normal_5fde2f6bd6867.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408873/normal_60592cc51dbf7.pdfIn PDF document text
    • https://cdn.sqhk.co/gumojitoxowu/Mjdie7x/dell_5490_datasheet.pdfIn PDF document text
    • https://jitavemalidev.weebly.com/uploads/1/3/1/8/131871699/8114403.pdfIn PDF document text
    • https://cdn.sqhk.co/mujejadalale/eBzghjN/copper_scrap_metal_prices_near_me.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/zuguvoxoki/selij.pdfIn PDF document text
    • http://jusaketij.rf.gd/57812267700.pdfIn PDF document text
    • http://nanojav.rf.gd/wexesatatutujisavex.pdfIn PDF document text
    • http://kimogule.epizy.com/menozakawizip.pdfIn PDF document text
    • http://goxajuvudabo.rf.gd/advanced_excel_formula_list_with_examples.pdfIn PDF document text
    • https://s3.amazonaws.com/kotodur/fifty_shades_of_grey_movie_download_in_hindi_480p_filmywap.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e198.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE198 5836 bytes
SHA-256: 82302e7fa1524ab5b7b24cc7b59fae4cce703814105392326edcdebc3e9eb7e3
font_01_sfnt_off0000f55b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF55B 11012 bytes
SHA-256: a1a53a922f99f94f80e92521d93a9380f6de0400fa676be29f7c54464ed4285e
font_02_sfnt_off00011a07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A07 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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