Malicious PDF — malware analysis report

Static analysis result for SHA-256 de2540ea19be994c…

MALICIOUS

PDF

104.3 KB Created: 2021-03-16 11:40:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 3957f8d6ef128035fb86dcdef7a49098 SHA-1: ab3acaf1b024f23e9cc3710ebef1b378a8d955ea SHA-256: de2540ea19be994c5a526669b104c1efa46e9261eb1b5617d5d65b6159f90e90
126 Risk Score

Malware Insights

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

The PDF file contains multiple embedded URLs, one of which is identified as a potential phishing lure for a public relations manager position. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high number of links on disposable hosting, suggesting a malicious intent to distribute phishing or malware. Although no scripts were explicitly extracted, the presence of embedded URLs and the ML classifier's high confidence score point towards a malicious phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • 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://bologen.ru/strik?utm_term=become+a+public+relations+manager PDF link annotation
    • http://libralab.digital/avh-4100nex_bluetooth_greyed_outoq8qw.pdfIn PDF document text
    • http://pop-marketplace.ru/notozebakononm30vy.pdfIn PDF document text
    • http://zoom-omsk.ru/gazaravixo78y5.pdfIn PDF document text
    • http://itasda.online/316979841161s5e.pdfIn PDF document text
    • http://grandov.pro/does_denna_remember_kvothenytsn.pdfIn PDF document text
    • http://ig-copyrightnotice.com/amplifi_tt_softwarea3ka0.pdfIn PDF document text
    • http://lorenbayi.com/best_books_for_computer_science3rq6g.pdfIn PDF document text
    • http://pycnidwzxc.info/475234152928o2n5.pdfIn PDF document text
    • http://pitushok.fun/81472444019q6cvt.pdfIn PDF document text
    • http://folokuvatajaweg.22web.org/pebufesibusitowisapan.pdfIn PDF document text
    • http://reestr.site/168469522719wbb.pdfIn PDF document text
    • http://xteenware.online/best_camera_focus_app_for_androidjoegq.pdfIn PDF document text
    • http://mainsale.info/peripheral_t_cell_lymphoma_treatment_guidelinesecolz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://situbepid.epizy.com/30136852356.pdfIn PDF document text
    • https://d115d978-d96a-40c8-9764-5d959708fc35.filesusr.com/ugd/436160_f15a76a05ab54e148dbcc637d73287d4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/326a0dd6-8243-4d82-99ff-41a4dce7751e/blade_180_cfx_servo.pdfIn PDF document text
    • http://vaxesopubowutuf.rf.gd/8533006814.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6960d891-ebb1-45c9-adc6-262f234dd0ac/what_is_a_onyx.pdfIn PDF document text
    • https://ad060920-74d0-4a59-a46a-f478898ed72a.filesusr.com/ugd/a7c1e6_2b9e6a66670145f3800c2743f8790da7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d871cd85-925b-4e50-b728-20639c507c01/31067892679.pdfIn PDF document text
    • http://jumirasex.epizy.com/freestyle_libre_2_user_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf4ed29f-d1fb-4c4d-a551-fcc0c6fdc77e/bugero.pdfIn PDF document text
    • https://67d298e0-85f4-4ad4-bf36-e1ac857e42fc.filesusr.com/ugd/b6bf5b_1888b0b3ef034f1c93639e390f9cd065.pdf?index=trueIn PDF document text
    • https://1c92f6d8-19eb-429c-9239-1cf6be91372f.filesusr.com/ugd/cc1a03_dd15b60bbf1345faaa90c4d3c1394fd7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/734ce3ca-ab76-40cd-aa55-52b6329616cf/list_simple_safety_devices.pdfIn PDF document text
    • http://dizoxijip.rf.gd/is_sexting_legal_in_indiana.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015a60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A60 5440 bytes
SHA-256: 86493639c193bcfecb84c304435121176265e10dddea25b7d7c93b4b2503dcbc
font_01_sfnt_off00016cc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16CC7 11476 bytes
SHA-256: bbe43ca79512fc9282ec4a055707cbab823cf803c007d3c21e9edf0eea2652e3

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