Malicious PDF — malware analysis report

Static analysis result for SHA-256 d36146f410aaa896…

MALICIOUS

PDF

97.5 KB Created: 2021-05-05 15:28:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: a88a3ce7c3f4f1006f3b1767348dd0b8 SHA-1: 78a10c3802fcd055869f82e7aa8c2c7cbb4d184b SHA-256: d36146f410aaa8962430213eb7c89a9ebdfe3d178c8812e2e57e1e7ce9f7b3e0
126 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on disposable domains and appear to be part of a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The presence of embedded URLs and the heuristic identifying it as a link farm support the attack pattern of luring users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://soxebez.ru/strik?utm_term=asp.net+tutorial+pdf+in+hindi PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4479921/normal_6062ce4667aee.pdfIn PDF document text
    • http://xopoxek.iblogger.org/shyam_baba_songs_free.pdfIn PDF document text
    • http://lifeshop.pro/how_to_install_adobe_premiere_rushe85j4.pdfIn PDF document text
    • http://kzrovk.xyz/crosley_record_player_how_to_work1vim7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500446/normal_6015c7d8aa6c2.pdfIn PDF document text
    • http://memijijarem.22web.org/47610076952.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493916/normal_5fc6b56317f1d.pdfIn PDF document text
    • http://hayatevesigar.online/how_to_get_netflix_on_lg_tv6guoz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420905/normal_604508396cdbe.pdfIn PDF document text
    • http://crysety.xyz/918633723389bi0d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484636/normal_60098700ce0ab.pdfIn PDF document text
    • http://kubadedo.iblogger.org/absite_questions.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://s3.amazonaws.com/tesasubawalozan/94667877377.pdfIn PDF document text
    • https://aabf49e0-5477-4fd2-8456-a986ef8f2a87.filesusr.com/ugd/9e14ca_7b5939e174b64f3596567a06bb82be3e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7ece3c2-bcf0-4350-b387-38e0bc98ae25/xojar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28b7870e-7694-43da-9428-353364af30a5/joxosadivaxewabuxisafuju.pdfIn PDF document text
    • https://s3.amazonaws.com/rizezobabub/77260194997.pdfIn PDF document text
    • https://7f1888b6-cdab-4603-9914-1cf81a8b29aa.filesusr.com/ugd/6846fe_007679a350e94b33a70594876bb0bb7e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3e4a8ab-a14a-471c-85e1-e6cc3c8d47c7/startup_of_your_own.pdfIn PDF document text
    • https://98e80eac-0673-4bf9-a3de-4132461903b3.filesusr.com/ugd/1acd69_822500d53a7f404e89fed40f4d476faa.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jizubisetebof/mere_christianity_study_guide_catholic.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0beeeda7-9c38-456a-b94a-c111e69b6882/lebujaso.pdfIn PDF document text
    • http://jubadoloje.epizy.com/gapobuvamidaxosawobumexog.pdfIn PDF document text
    • https://bed2724e-b6a4-42c6-a365-5b2dc6a82e2f.filesusr.com/ugd/9f087b_b919ba21afd94ecdb30de8bd8fd0b329.pdf?index=trueIn 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://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000100ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100CE 5148 bytes
SHA-256: 8df9158f4eaf2541a515e2e3039b1511fd32bc4976a0fe17c0671f6590f8bc9e
font_01_sfnt_off00011249.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11249 3720 bytes
SHA-256: d5ecec3e822993868ba70e247019bcdb656a9fee58d620eb93bc70658e929280
font_02_sfnt_off00011dac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DAC 13928 bytes
SHA-256: 7710f31e85187e14d4081386663d057c565d907c57eaa98c98b3f98f786f98ae
font_03_sfnt_off00014b72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B72 14232 bytes
SHA-256: eb8c7673efc6033eb38404e069323dea8442fc4cee186eee6f8448aa10a540d8

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