Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7190b43b5f5ff47…

MALICIOUS

PDF

83.6 KB Created: 2021-03-30 21:02:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2205c749f95a11dacc1246fc59c5e0b3 SHA-1: 504e8d34005e6fb2a52987166948a49821a0c839 SHA-256: c7190b43b5f5ff471c8ae4c5d025720792ce2f463ab9f35692bacfac22c0dbaa
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1204.002 Malicious Link

The PDF contains numerous external links, many of which are SEO-optimized and point to potentially malicious content, as indicated by the 'PDF_SEO_LINK_FARM' and 'ML_NYX_PDF_MALICIOUS' heuristics. The document body, though heavily obfuscated, suggests a lure related to an 'Adobe pdf maker error', likely a social engineering tactic to trick users into clicking malicious links. The 'SE_CLICKFIX' and 'SE_SECURITY_BYPASS' heuristics further support a malicious intent to trick users into executing commands or disabling security measures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 7

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://jacksth.ru/award?keyword=adobe+pdf+maker+error
    • http://jologedeb.getenjoyment.net/leadership_theory_application_skill_development_free.pdf
    • http://dujojiwasemob.mywebcommunity.org/76812345888.pdf
    • http://bagesopabiwub.scienceontheweb.net/rebisokowabe.pdf
    • https://fudanologakobur.weebly.com/uploads/1/3/5/3/135394175/a1e7a90cf.pdf
    • https://vukezozonobobex.weebly.com/uploads/1/3/1/3/131383599/zudugavitazugaxamel.pdf
    • https://bujupovira.weebly.com/uploads/1/3/4/4/134472582/ladegibemulopa_dodaju_fawar_gexilufuzepijez.pdf
    • https://rovonowevon.weebly.com/uploads/1/3/6/0/136051941/6392025.pdf
    • https://varusimutajol.weebly.com/uploads/1/3/4/5/134502614/4859616.pdf
    • http://xuxijosut.sportsontheweb.net/acupuncture_points_for_sleep.pdf
    • http://xukosususif.medianewsonline.com/backstepping_controller.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/mexavofezoxi/flow_meter_measurement_lab_report.pdf
    • https://a43ab9c2-5efb-4cee-ac06-b782a0f5e207.filesusr.com/ugd/4826f5_107a375850f742fcaa839858e9a87731.pdf?index=true
    • http://xobibaga.myartsonline.com/genuwekexitu.pdf
    • https://a35aa970-3e4e-4c20-be1f-53d10001bce9.filesusr.com/ugd/af4e73_b7b09dffea7e47dcbf9c7fdd9844be9c.pdf?index=true
    • https://s3.amazonaws.com/pekatikisuruki/three_addends_worksheet.pdf
    • https://s3.amazonaws.com/wixamupelinere/wfaa_dallas_reporters.pdf
    • https://s3.amazonaws.com/voxipanovigepiv/difekuvu.pdf
    • https://s3.amazonaws.com/pukiza/27120870461.pdf
    • https://87c8fc71-818b-4167-bf0d-2ac3bc49ffd1.filesusr.com/ugd/f9d4cd_ceca56ec15fa447596e6b8fd6add36fa.pdf?index=true
    • https://0a3c8164-ddd9-4522-8472-457ce31ece15.filesusr.com/ugd/d32f78_0fc05c8df1c349b898cd2576623dd1ce.pdf?index=true
    • http://loxupobupibim.atwebpages.com/combined_gas_law_sample_problems_with_solutions.pdf
    • https://s3.amazonaws.com/dupula/irobot_roomba_960_robot_vacuum_walmart.pdf
    • https://s3.amazonaws.com/nilafafakem/18101607099.pdf
    • https://s3.amazonaws.com/numunenoji/89983842238.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e74e.bin
0d5be60fe202f0379a803a1958804c68c9c462535eb174893711919b551ba95f
pdf-font-stream PDF embedded font (sfnt) at offset 0xE74E 4724 bytes
font_01_sfnt_off0000f751.bin
eab0dd1c515a7c2d6c07a57df2d70a604343d2b28908cc28276f740e0be43548
pdf-font-stream PDF embedded font (sfnt) at offset 0xF751 10680 bytes
font_02_sfnt_off00011c03.bin
a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C03 16204 bytes
font_03_sfnt_off00013130.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378
pdf-font-stream PDF embedded font (sfnt) at offset 0x13130 4324 bytes