Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf1b5bf8e96de028…

MALICIOUS

PDF

80.5 KB Created: 2021-04-07 00:47:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 13958395c99b1708a0005aa4a10b5c71 SHA-1: de233c358d8ae40bca495bc373655d0d9b73e4f4 SHA-256: bf1b5bf8e96de0283ca1138fdd4c2b848daa3394c2e9aaa2477f227dc08ee312
186 Risk Score

Malware Insights

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

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 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://midufefew.ru/strik?utm_term=how+to+find+one+interior+angle+in+a+polygon PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4459791/normal_5ff9adf11123b.pdfIn PDF document text
    • https://nifilova.weebly.com/uploads/1/3/0/7/130740060/ded60f80.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425009/normal_6021e93797bee.pdfIn PDF document text
    • http://pedakuf.22web.org/printable_biodata_form_philippines.pdfIn PDF document text
    • https://cdn.sqhk.co/dapumexader/ijjhl6g/felemineg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454543/normal_600be39ee921d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408719/normal_604b0a24974c7.pdfIn PDF document text
    • https://cdn.sqhk.co/rabataxuvax/xigjekE/idle_theme_park_tycoon_aqua_park_cheats.pdfIn PDF document text
    • https://jasugigikimodo.weebly.com/uploads/1/3/1/3/131383258/wuxafago.pdfIn PDF document text
    • https://rojofasefimo.weebly.com/uploads/1/3/1/6/131636828/zamokejabejevinumusu.pdfIn PDF document text
    • https://cdn.sqhk.co/farafakilof/ds2fVd3/xesaxavupusigekupum.pdfIn PDF document text
    • https://koberowebajufom.weebly.com/uploads/1/3/4/0/134096943/8b6382398ed8.pdfIn PDF document text
    • https://naluzakagowu.weebly.com/uploads/1/3/1/4/131411806/ef4a0e1e675a108.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/gulapore/24976141739.pdfIn PDF document text
    • https://c6111751-42b6-464f-a8b1-832d492ff999.filesusr.com/ugd/3d0627_e2ed28cbffc44a638da1d3154320ff88.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rubidokezive/karvy_investment_report.pdfIn PDF document text
    • https://45884d5c-3037-4093-99f9-9b9c28a1e9f0.filesusr.com/ugd/3721b1_40ffedd5df974133a95c47a5e10d33f7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/davawina/subway_surf_hile_cretsiz_indir.pdfIn PDF document text
    • https://b724dda4-e2e0-47c5-811c-ae3b7273578b.filesusr.com/ugd/a1e5ee_ed4d4caab2aa4c0a88eccdf9116ce816.pdf?index=trueIn PDF document text
    • https://cae2aa39-5014-47ec-b549-0fed73f36d02.filesusr.com/ugd/c8683e_211760db578a40ef91fec32dc6e6b610.pdf?index=trueIn PDF document text
    • https://1a2149e7-ca7f-4e7c-a584-0e483de6f3af.filesusr.com/ugd/9219f8_49c08140df7749c6b318e0c38d0c5360.pdf?index=trueIn PDF document text
    • http://woposatet.epizy.com/lademagomov.pdfIn PDF document text
    • https://s3.amazonaws.com/jeworurowam/18157712875.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A0 5184 bytes
SHA-256: d2bb29563c7116d7955f9e4e184a2554852db5df6208a3881c27aaee73356c6e
font_01_sfnt_off0000fa6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA6F 10808 bytes
SHA-256: 48036fa624f896e356b88a10e05c20c61faf3c97ef2f0adde99edd8f1062162a
font_02_sfnt_off00011f7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F7D 16072 bytes
SHA-256: f3b752e25d2e3098dc5b351a512c5ca672d2b137fcb7ddb3f81b2384be51d5c3