Malicious PDF — malware analysis report

Static analysis result for SHA-256 755186af434b9b08…

MALICIOUS

PDF

110.5 KB Created: 2021-03-04 16:25:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 05aa3ee85e3a385932d3066565b5e937 SHA-1: 7ef70935e3f545eb01cca01629cc9cf6baa2a289 SHA-256: 755186af434b9b08f958ed0ac5202246a4afb10d6ac0bbc667edb4bf9660f388
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The ClamAV detection and ML classifier indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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 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://golowaki.ru/award?keyword=yamaha+mg24+%252F14fx+mixer+manual PDF link annotation
    • https://getiwojaxewife.weebly.com/uploads/1/3/4/0/134012456/rugigexibobovuxeve.pdfIn PDF document text
    • http://mojenisijita.mywebcommunity.org/folirikalurixererigo.pdfIn PDF document text
    • https://tetuxexe.weebly.com/uploads/1/3/1/8/131871535/3222556.pdfIn PDF document text
    • http://derilezin.sportsontheweb.net/katawa_shoujo_rin_path.pdfIn PDF document text
    • http://nevinidonet.mywebcommunity.org/jupad.pdfIn PDF document text
    • http://loletopuwiv.iblogger.org/lovigogotusar.pdfIn PDF document text
    • http://sedouche.xyz/jane_norman_abc_reporterlodm8.pdfIn PDF document text
    • https://sunarikibuniteg.weebly.com/uploads/1/3/1/3/131381519/5274188.pdfIn PDF document text
    • http://kyhni.site/milwaukee_road_beer_linesj5lm.pdfIn PDF document text
    • https://fovubimosifiwu.weebly.com/uploads/1/3/4/3/134324820/menizo_koxesimu_gepuwiporexig_volufulur.pdfIn PDF document text
    • https://paboripiniw.weebly.com/uploads/1/3/0/7/130739049/tijineke.pdfIn PDF document text
    • https://melivuwupazadog.weebly.com/uploads/1/3/4/7/134721584/359775ed719290a.pdfIn PDF document text
    • http://canlisohbetim.net/offensive_security_certified_professional_bookq9ogv.pdfIn PDF document text
    • https://rewumakabaw.weebly.com/uploads/1/3/4/8/134856880/8245a3f2.pdfIn PDF document text
    • https://zebazefapik.weebly.com/uploads/1/3/1/3/131383848/5029214.pdfIn PDF document text
    • http://table-wait.com/850362298869rvr2.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
    • http://rajiwewovipu.epizy.com/digital_vernier_caliper_least_count.pdfIn PDF document text
    • http://xubedoper.epizy.com/reference_letter_for_rental_template.pdfIn PDF document text
    • http://dozuxix.myartsonline.com/zoom_h4n_pro_mic_stand_adapter.pdfIn PDF document text
    • http://tovujopojat.epizy.com/no_answers_lyrics.pdfIn PDF document text
    • http://gujimosodaza.myartsonline.com/76366920864.pdfIn PDF document text
    • http://nejesezape.myartsonline.com/rekanudi.pdfIn PDF document text
    • http://zopefunexot.epizy.com/os_coliformes_totais_e_termotolerantes.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_off000155a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155A4 5032 bytes
SHA-256: fdaa6669ed1e70b0152d746317c44f6f351eecf68e23a46b1a456752071b17de
font_01_sfnt_off000166ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x166AC 18376 bytes
SHA-256: 82c2e5f3411ef489f2226236de08d5dcdad97e7023f5b09ea6a9177aa67ccf90
font_02_sfnt_off00019da4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19DA4 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176