Malicious PDF — malware analysis report

Static analysis result for SHA-256 011cfbc9d83761db…

MALICIOUS

PDF

75.5 KB Created: 2021-04-12 19:49:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: afc15b8a2c4171f61f264864d2afe1d6 SHA-1: 61403cab971920d29666c1d14dfc53b31b813782 SHA-256: 011cfbc9d83761db938070ceaa18868dbb2cf46feb90155a7a1f3d7029e5de77
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, indicating a link farm designed to direct users to potentially malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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 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://xezojetit.ru/strik?utm_term=nook+hd+plus+battery+not+charging PDF link annotation
    • https://cdn.sqhk.co/rowibimibopi/3ihidMS/screen_stream_mirroring_app_download.pdfIn PDF document text
    • https://xasirazabad.weebly.com/uploads/1/3/4/6/134699738/2557242.pdfIn PDF document text
    • https://cdn.sqhk.co/tujarazimok/YuhhgeO/soapstone_incense_burner_tower.pdfIn PDF document text
    • http://matteset-spon.space/agricultural_marketing_channelsn1xh0.pdfIn PDF document text
    • https://fazodokivev.weebly.com/uploads/1/3/4/0/134018208/zazalet-kagusu-xosenakowadi.pdfIn PDF document text
    • https://cdn.sqhk.co/nefikelifu/WfipjhA/sweet_pop_cookie_land_mod_apk.pdfIn PDF document text
    • http://coloradocustomelectric.com/xazagugujonetajuvax0zrkr.pdfIn PDF document text
    • http://bigchance.pw/money_reiki_symbolsqgz58.pdfIn PDF document text
    • https://danivuzi.weebly.com/uploads/1/3/2/6/132681213/niwesusaxugovikuju.pdfIn PDF document text
    • https://voxapinave.weebly.com/uploads/1/3/2/7/132740917/9764cbe.pdfIn PDF document text
    • https://lutovadefok.weebly.com/uploads/1/3/3/9/133997447/7756262.pdfIn PDF document text
    • https://xijutenidipes.weebly.com/uploads/1/3/0/7/130775364/juvanub-gevowixoroxa-vusifoluba.pdfIn PDF document text
    • https://cdn.sqhk.co/rerunaropiz/cjcRxHt/satuzapaguwur.pdfIn PDF document text
    • https://padawevuwelidas.weebly.com/uploads/1/3/1/4/131438111/zepowelunaziv.pdfIn PDF document text
    • https://woziwapimarezex.weebly.com/uploads/1/3/5/4/135400795/gulokikalupap_wonumovaxazazol_luwezexu_dilabobam.pdfIn PDF document text
    • https://cdn.sqhk.co/fagaluwozez/hco51jV/mibomej.pdfIn PDF document text
    • http://lessonsonline.site/1uobpc.pdfIn PDF document text
    • http://zubiki.top/66841930089h5yje.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/folexapurilowe/59076241417.pdfIn PDF document text
    • https://18cb0a1d-3822-48a5-9ca0-56465202bc9b.filesusr.com/ugd/96564c_42045ed827624411b1c8a06758c80e9d.pdf?index=trueIn PDF document text
    • https://8d5bcf17-53f2-4f21-b585-7a27aef14131.filesusr.com/ugd/7baf93_ae712b0e9c5a407785e908c7e4a9b731.pdf?index=trueIn PDF document text
    • https://d190c387-1498-4382-a59e-98d1a0a9794c.filesusr.com/ugd/a91264_48313a92daf24a4193733685779f38bb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jivamubug/zekavivaxefixeg.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_off0000e5c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C9 5612 bytes
SHA-256: a68071c7912c999816931f43ed2fe576958e9a97a8154ec545ee56f0948c24cf
font_01_sfnt_off0000f8e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E6 12268 bytes
SHA-256: 197567873b261494166e5dc182a57865d858ca666878861dcd921c61d1a54829