Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f7435809512bb8a…

MALICIOUS

PDF

85.7 KB Created: 2021-04-06 16:41:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 7ce00d8da45f344f59fef4ec5c367768 SHA-1: 54bc11f8b365c9db66924d263210a1a19e232621 SHA-256: 9f7435809512bb8a66bec690825f31bf9ce2485bc0176579e43eea653f0ce0db
226 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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.
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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/aws?utm_term=echo+weed+trimmer+start PDF link annotation
    • https://wawogikaso.weebly.com/uploads/1/3/4/7/134726687/zikagodaz.pdfIn PDF document text
    • http://zuxegesa.iblogger.org/human_anatomy_atlas_2020_free_ios.pdfIn PDF document text
    • https://gifukupuwabe.weebly.com/uploads/1/3/0/7/130775529/wojug_rixikusaga_naferotejive.pdfIn PDF document text
    • https://jujoxiro.weebly.com/uploads/1/3/4/8/134875196/1413268.pdfIn PDF document text
    • https://zewadozodatigi.weebly.com/uploads/1/3/4/3/134337643/d8400f68bbeab1.pdfIn PDF document text
    • https://lekibuwowobaveg.weebly.com/uploads/1/3/5/2/135295955/6610320e6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366354/normal_60407958b9f3a.pdfIn PDF document text
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.pdfIn PDF document text
    • http://podjem2.club/28099805104w4936.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410414/normal_60094d6ed6d72.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453900/normal_605aa8b15eac2.pdfIn PDF document text
    • https://makirogu.weebly.com/uploads/1/3/0/9/130969002/3c217fb481dcc72.pdfIn PDF document text
    • http://koteyarn.moscow/how_to_connect_soundbar_to_a_lg_tv1st9f.pdfIn PDF document text
    • https://wuvipovuzodex.weebly.com/uploads/1/3/4/8/134846945/2607808.pdfIn PDF document text
    • https://kasasifu.weebly.com/uploads/1/3/4/6/134697732/8790560.pdfIn PDF document text
    • http://sale20.site/legebonamejoba3jfbt.pdfIn PDF document text
    • http://managerprogram.live/98316646748oqfkx.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4505125/normal_60298401e0163.pdfIn PDF document text
    • http://presalle.xyz/g35_transmission_fluid_manual8281n.pdfIn PDF document text
    • https://muzifadisuluso.weebly.com/uploads/1/3/5/3/135347683/pubinofewove_jevamuwipuzus_rafenitoda_fanowinejo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zikepodaw.epizy.com/16063353760.pdfIn PDF document text
    • http://fazafof.rf.gd/flight_radar_tracker.pdfIn PDF document text
    • http://piwukoge.rf.gd/26537924053.pdfIn PDF document text
    • http://wereguvepowu.epizy.com/guilty_barbra_streisand_barry_gibb_free.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_off00010f87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F87 5196 bytes
SHA-256: e5ed6afbafa74140fc7864f9c4c3c946fac560b291d4ad5b68b52086cf482abd
font_01_sfnt_off0001211c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1211C 11376 bytes
SHA-256: e4b806190d04bcf0f6ac217a79aed9dfb237813449e05bc4ae298294d0b6ac52