Malicious PDF — malware analysis report

Static analysis result for SHA-256 44c96653dc8577e7…

MALICIOUS

PDF

75.5 KB Created: 2021-02-04 09:45:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 8086090ca063f36826f44b2faaba480a SHA-1: 382212bd279738cd0162895f244e9bc8d388d6fa SHA-256: 44c96653dc8577e76ff14dbb0e2f1ddf3cfeffc13dc84fe7cf46dd395892e2ca
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. One of the embedded URLs, 'https://bologen.ru/aws?utm_term=sheet+metal+forming+process+nptel', is likely part of this scheme. No scripts were extracted, but the PDF structure itself is used to host and redirect to numerous external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://bologen.ru/aws?utm_term=sheet+metal+forming+process+nptel PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4421199/normal_5fe608dc2dd3e.pdfIn PDF document text
    • https://latezuletarok.weebly.com/uploads/1/3/5/2/135298634/4202805.pdfIn PDF document text
    • https://gokepitamewema.weebly.com/uploads/1/3/5/3/135325242/tifanevopibugifus.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476427/normal_5fc95fd345502.pdfIn PDF document text
    • https://rerutafedebe.weebly.com/uploads/1/3/2/8/132815298/5591043.pdfIn PDF document text
    • https://tilawifi.weebly.com/uploads/1/3/4/4/134480999/gebupimobaxidegotat.pdfIn PDF document text
    • https://cdn.sqhk.co/suxavawudomo/jxji4Oc/mojatoreja.pdfIn PDF document text
    • https://cdn.sqhk.co/woledibiroju/VhfhjMd/9861073845.pdfIn PDF document text
    • https://cdn.sqhk.co/nezerozara/3x62veU/fibiwamemigonifebubokuki.pdfIn PDF document text
    • http://liko-sneakers.com/project_management_case_studies5doqu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412413/normal_5ff1d98662b82.pdfIn PDF document text
    • http://lisolu.org/vj_top_recharge_online_reseller_programse7f8x.pdfIn PDF document text
    • https://vifiboreb.weebly.com/uploads/1/3/5/3/135349596/3a16a.pdfIn PDF document text
    • https://saduzoxizujakef.weebly.com/uploads/1/3/1/0/131071125/c0906dfb6623a1b.pdfIn PDF document text
    • https://vepemetamat.weebly.com/uploads/1/3/4/3/134354227/fijopozudafokig_xewozabi_zoveluzel_duxoperaniwaxew.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423452/normal_5fc95ce30977a.pdfIn PDF document text
    • https://fosaxobe.weebly.com/uploads/1/3/4/8/134882536/accd6ce7202228.pdfIn PDF document text
    • http://tonagruz.ru/sap_bpc_guideojlto.pdfIn PDF document text
    • https://tesetugunujogub.weebly.com/uploads/1/3/4/0/134040467/aacad3938f8.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/vufuzewasi/jurassic_park_builder_mod_apk_unlimited_everything.pdfIn PDF document text
    • https://s3.amazonaws.com/fizufapu/baixar_app_aliexpress_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/zagubip/40686151873.pdfIn PDF document text
    • https://s3.amazonaws.com/bejikefowu/2031171363.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_off0000db4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB4F 5320 bytes
SHA-256: 943435f2599df179e8615a1c8af5b484c22001034f3190e2fe266777955f8df1
font_01_sfnt_off0000ed37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED37 11160 bytes
SHA-256: a55b9e38fdac7a198282018cf5f55ad4deef3df0d14c8c5c9e40c05b2304bac4
font_02_sfnt_off000111dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111DC 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176