Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1bbf74e3e77b9dc…

MALICIOUS

PDF

70.6 KB Created: 2021-03-24 18:53:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: d48985b116f89c8284173bca567cacbf SHA-1: 60f9ea7949e45c721457d679f96cee6bad9809b9 SHA-256: e1bbf74e3e77b9dc54725589ec2b90c8b3468442338937e7ad4243510f1c9da8
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains, suggesting a link farm or phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs and the nature of the heuristics point towards a phishing or malware distribution scheme, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://gimoguvi.ru/strik?utm_term=bissell+proheat+turbo+instructions PDF link annotation
    • http://mon-compte-cmb.best/what_is_philosophy_logical_positivismpfcf3.pdfIn PDF document text
    • https://vinaribibivo.weebly.com/uploads/1/3/1/8/131871854/xokikutiwapegemow.pdfIn PDF document text
    • https://xozojijeb.weebly.com/uploads/1/3/4/4/134436315/8534865.pdfIn PDF document text
    • http://unreguezff.rest/kanetamawe8rhxt.pdfIn PDF document text
    • http://dikerulaba.22web.org/60623120342.pdfIn PDF document text
    • https://sojagifuwolu.weebly.com/uploads/1/3/4/6/134689160/5446986.pdfIn PDF document text
    • https://fizijoju.weebly.com/uploads/1/3/0/8/130814030/rowunolevojoj_gefik_kebutumadasox_pemaboxisilov.pdfIn PDF document text
    • http://kabonuwumew.66ghz.com/android_9_os_for_pc.pdfIn PDF document text
    • https://fanuterose.weebly.com/uploads/1/3/3/9/133999321/kurudopuzugomuj-fetemefuxunuje.pdfIn PDF document text
    • https://worijuxadije.weebly.com/uploads/1/3/4/8/134863955/a545bd6ed7ef86.pdfIn PDF document text
    • https://wafiludelo.weebly.com/uploads/1/3/1/4/131437380/42dbd8f11.pdfIn PDF document text
    • https://loneluripovulom.weebly.com/uploads/1/3/4/3/134364014/sizejajodov.pdfIn PDF document text
    • http://rixorazenofig.iblogger.org/30513162408.pdfIn PDF document text
    • http://doruguduku.iblogger.org/can_you_hit_a_dog_if_it_bites_you.pdfIn PDF document text
    • http://damomemisogadex.iblogger.org/punuturuwum.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b54663a3-ff9d-4122-b75c-69b71428c9b0.filesusr.com/ugd/cfa91a_cce44412bd39456593cd6e9796dd6a3d.pdf?index=trueIn PDF document text
    • https://77701ba7-c5ad-4750-ab17-5b03548f7fc0.filesusr.com/ugd/9a242c_1de1d140f8724dd597718be0a7853a7d.pdf?index=trueIn PDF document text
    • http://wesovipimamino.epizy.com/xasolubitovege.pdfIn PDF document text
    • https://b064d0e4-88d6-4b7e-8087-8ebf790fcba6.filesusr.com/ugd/ca32a8_e1635336af714879b324204b2c61f2b5.pdf?index=trueIn PDF document text
    • http://vapojolojumow.rf.gd/xigeviketirojop.pdfIn PDF document text
    • http://temitiz.epizy.com/wewoxozu.pdfIn PDF document text
    • http://lifedebidabu.rf.gd/radius_of_convergence_of_maclaurin_series_calculator.pdfIn PDF document text
    • http://tividisexagit.epizy.com/dilotizukukevawovebaw.pdfIn PDF document text
    • https://df9240ce-57b4-430e-a582-521170ca5232.filesusr.com/ugd/10b03a_7f85d1e6f4f84a5f96dd47b857f4787e.pdf?index=trueIn 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_off0000d538.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD538 5212 bytes
SHA-256: f4745ac380dd97994605dcef44feefcd667abea554f0f8ff24cba08d6672e99a
font_01_sfnt_off0000e6e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E4 10980 bytes
SHA-256: eb57e90e33719c1fc4cf198c608b565f2c06ecba8edcc9788d7b64ffe37474ff