Malicious PDF — malware analysis report

Static analysis result for SHA-256 48937e1a0c5887f1…

MALICIOUS

PDF

84.1 KB Created: 2021-03-19 18:58:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4560cb2c88c40e5f9e3a26222b9d09fd SHA-1: 19634aa8f03461785abb16ccafa744f8f357af22 SHA-256: 48937e1a0c5887f1e78f793c656e6c87876cb8ea4d29187fb95e6c45c2435717
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, many pointing to disposable domains, as indicated by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent. The primary URL, https://midufefew.ru/aws?utm_term=fanuc+18+t+operator+manual, appears to be a lure for search engine optimization or to redirect users to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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.
  • 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 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://midufefew.ru/aws?utm_term=fanuc+18+t+operator+manual
    • http://midopan.iblogger.org/dajepuwovalagapum.pdf
    • https://datagoso.weebly.com/uploads/1/3/4/7/134718767/kabomanuki_difarojiwetelik_tumeziparopanal.pdf
    • http://zusiwibewire.mypressonline.com/z_table_critical_value_calculator.pdf
    • https://ralirepiputup.weebly.com/uploads/1/3/4/8/134852471/9286645.pdf
    • http://reabook.online/mm1_chinning_guide_osrsknh7e.pdf
    • https://rilopogikumifo.weebly.com/uploads/1/3/4/3/134320310/7878065.pdf
    • https://vawovuwowoxug.weebly.com/uploads/1/3/4/0/134040368/gaseduza.pdf
    • https://bifimazetaxa.weebly.com/uploads/1/3/5/3/135326975/09d55379745b9c3.pdf
    • http://cloudmarket.website/3-_5-_2_attacking_patternsb02t5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://160e4e15-e27a-4ef2-9b26-f67fc0969a86.filesusr.com/ugd/cbdbb6_75a1e02b80ed438299652b9b07c530ca.pdf?index=true
    • http://sasuwirakib.rf.gd/rorabebagegaji.pdf
    • https://s3.amazonaws.com/tezude/idea_of_justice_book_price_in_india.pdf
    • https://4cd5a77a-be8d-44ba-8952-4177873115c4.filesusr.com/ugd/930050_89063a0952b745f1ae36705d62c9bbc3.pdf?index=true
    • http://vorasatijede.rf.gd/24003883727.pdf
    • https://s3.amazonaws.com/fukepez/55317839918.pdf
    • https://6e229dea-1f83-4be8-8cd3-388eabd4f5e3.filesusr.com/ugd/1cfe37_17ef436e48e74dae984e80fa61035369.pdf?index=true
    • https://s3.amazonaws.com/gagagakigibapo/crime_reports_west_san_jose.pdf
    • https://7d6e376e-1ee3-4df5-88c1-8d1511d419f8.filesusr.com/ugd/7dd30d_fac4fbd8e9c84ef7b15dd40386264567.pdf?index=true
    • http://maxuluxusit.atwebpages.com/the_absolute_basics_of_the_christian_faith.pdf
    • http://benamow.myartsonline.com/56086900129.pdf
    • http://fusarafabar.epizy.com/8302205043.pdf
    • https://s3.amazonaws.com/meludav/20980340433.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edcc.bin
d2cc2fa22f3aca4f2dc6d1dc0da7b54e8401593e74590d2d438dcf9d8201d8ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCC 5104 bytes
font_01_sfnt_off0000ff1b.bin
e636b566c9e6659e81fcd0fc4849aa4a7998f84223b88200e668c49f6fb6c82a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF1B 14852 bytes
font_02_sfnt_off00012d60.bin
e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12D60 16204 bytes

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