Malicious PDF — malware analysis report

Static analysis result for SHA-256 d989a80162720aa7…

MALICIOUS

PDF

83.5 KB Created: 2021-05-18 18:47:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 73186c6ee52b457abc7f0c6b03ec97e6 SHA-1: 52938cc63500fc8f6fe865b9555a5335f244eaa3 SHA-256: d989a80162720aa75bb23c5b2a9df2f8acd8bd97ec1774f2624355e6da0895e1
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://crophysi.ru/strik?utm_term=numeros+ganadores+mega+lotto+loteka PDF link annotation
    • https://kufudazasa.weebly.com/uploads/1/3/4/6/134626120/tikufuwisaxomaze.pdfIn PDF document text
    • http://pumujavebedopa.iblogger.org/xeketutewujol.pdfIn PDF document text
    • https://guwadutu.weebly.com/uploads/1/3/5/3/135347148/1e95530446b.pdfIn PDF document text
    • https://moxetutatag.weebly.com/uploads/1/3/4/2/134234950/rogumoba_betadid_sovirotuzagus.pdfIn PDF document text
    • https://bojifigo.weebly.com/uploads/1/3/4/8/134847606/6183322.pdfIn PDF document text
    • http://jusibebobekig.iblogger.org/naxolav.pdfIn PDF document text
    • https://sirukume.weebly.com/uploads/1/3/0/8/130814715/nupekiwu.pdfIn PDF document text
    • https://xixirebuwujesi.weebly.com/uploads/1/3/5/9/135989839/nikewonupidige.pdfIn PDF document text
    • https://lidugozomamaxo.weebly.com/uploads/1/3/1/6/131606349/tidokoto.pdfIn PDF document text
    • https://juzumefewuw.weebly.com/uploads/1/3/4/7/134766708/galini_sewomuge_satimagazo.pdfIn PDF document text
    • https://fofirajajamide.weebly.com/uploads/1/3/4/6/134643930/6932381.pdfIn PDF document text
    • http://bumexusuladix.iblogger.org/cics_application_programming_reference_manual.pdfIn PDF document text
    • https://pasironukid.weebly.com/uploads/1/3/0/8/130814081/9470756.pdfIn PDF document text
    • https://rinapaluvubozi.weebly.com/uploads/1/3/4/6/134669605/3978503.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/f60d4ae9-9c59-4bbe-af87-8520b902db89/43406375092.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0893dc83-71bf-496a-8708-d5cfb74aa328/how_can_sinkholes_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3156a51a-7629-446e-a928-2fa2f8bcd325/jobedumofoboxupumin.pdfIn PDF document text
    • http://wukofufo.rf.gd/soluxuzupinipoba.pdfIn PDF document text
    • http://konevimojo.epizy.com/bhu_bsc_geology_syllabus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87f810fb-5094-49ee-87d9-305ab8a1558e/39541965491.pdfIn PDF document text
    • http://rixupod.rf.gd/java_jdk_6_64_bit_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a5a1353-0508-44fc-8985-5739f7dfab67/64442361842.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ede9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE9 6744 bytes
SHA-256: 048fb1891f432488516cd811e7b04d68e7d39e548ca3495625137f8fb0c23ff4
font_01_sfnt_off0000fece.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFECE 5180 bytes
SHA-256: 9d04c4f9b8669ac0c615c5e63d6a3d7834a59adcffe26c8f06a7597ee68c1ec5
font_02_sfnt_off0001104a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1104A 1932 bytes
SHA-256: 4aa063a26bd9e70ad0d04acb797bb2078f152c78321be1114478748fdf4fbf58
font_03_sfnt_off0001198c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1198C 11604 bytes
SHA-256: 59ed235892725f7e7c7d8a9cb0f324ce0593dc0169e93a1e57e43ff35988cb0b