Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cfaaecee6d2a98f…

MALICIOUS

PDF

82.2 KB Created: 2021-03-29 10:21:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 12ca0e409bedf0375ebeb5cf445eb8bb SHA-1: 24e156db9de65fff2d52d14c3506ffd477f8cb5c SHA-256: 1cfaaecee6d2a98f4ec04ea9d4426501e43d9176364826cc239453894a185d3e
224 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains multiple embedded URLs, with one identified as a malicious redirector. The 'SE_CLICKFIX' heuristic indicates social engineering tactics designed to trick the user into executing commands, likely to download and run a secondary payload. The ML classifier and ClamAV detection strongly support a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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.
  • 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://dafemum.ru/strik?utm_term=why+won%2527t+my+sony+vaio+screen+turn+on In PDF document text
    • https://cdn.sqhk.co/nopawuwam/dagdnic/16399631203.pdfIn PDF document text
    • http://bigijawiv.scienceontheweb.net/anemia_aplastik_usu.pdfIn PDF document text
    • https://cdn.sqhk.co/xumirikebixo/cjgciif/tuzefizotajufupuwogosuji.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450504/normal_5fed689d6cdb2.pdfIn PDF document text
    • http://rebibedo.mywebcommunity.org/fizadotonagezugekinexiba.pdfIn PDF document text
    • http://menawamuno.iblogger.org/biwogunogufa.pdfIn PDF document text
    • https://lixudovu.weebly.com/uploads/1/3/4/5/134598000/buxesogi-xivabuziguvud.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413969/normal_604cd195729cc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477408/normal_600bcbd7bd52d.pdfIn PDF document text
    • https://pabifiliponisod.weebly.com/uploads/1/3/4/3/134367040/4970752.pdfIn PDF document text
    • https://gilanevevo.weebly.com/uploads/1/3/0/7/130739192/c924897c1fdc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446158/normal_602e20cf21e6e.pdfIn PDF document text
    • https://kofovozeregom.weebly.com/uploads/1/3/4/3/134313602/c2c5eba66e7e76e.pdfIn PDF document text
    • https://cdn.sqhk.co/leporolino/yiggcDF/open_camera_android_app_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479674/normal_5ffc16cb93f2b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ddc38bf-6001-4f7a-847d-7f9655d770aa/read_maya_banks_highlander_series.pdfIn PDF document text
    • http://naxepedawizozet.onlinewebshop.net/ninaxox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03cf9238-1077-4915-9f88-9df29dafb70d/24297020641.pdfIn PDF document text
    • http://sarozaxag.epizy.com/44308939941.pdfIn PDF document text
    • http://zulidemuw.epizy.com/whirlpool_ultimate_care_ii_wont_spin_or_drain.pdfIn PDF document text
    • http://koburolamugalo.rf.gd/pc1616_add_user.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/056a3afa-9a41-40b8-99ed-e8aeb382672e/ovid_metamorphoses_summary_book_4.pdfIn PDF document text
    • http://xirotowukutizu.epizy.com/antihistaminicos_pediatria.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_off0000eb83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB83 5308 bytes
SHA-256: 1d029479cbb830dcd6b4b615917de02a34221ee63d60d221129d0e9e6083f3a7
font_01_sfnt_off0000fd8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD8B 11244 bytes
SHA-256: 000071bd535951b56e42283f96c5f6688104273c5b8277e9635508f49676b39e
font_02_sfnt_off00012418.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12418 16204 bytes
SHA-256: e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15