Malicious PDF — malware analysis report

Static analysis result for SHA-256 1de359dc3545aec2…

MALICIOUS

PDF

91.3 KB Created: 2021-04-05 05:26:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 55dfdbdd5a948fc379f5be98d227c0c3 SHA-1: 744dfceefdfd73adae85727942cbca3c26dd8383 SHA-256: 1de359dc3545aec25b3cca49f27bd6be888397b5f9ae9ca8c7b9a1ec2251eca5
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it contains a large number of external links, a common tactic for SEO spam or phishing. The embedded URL 'https://soxebez.ru/123?utm_term=strategic+thinking+test+pdf' is a primary indicator of malicious intent, likely leading to a phishing page or malware download. Although no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 5

  • 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
  • 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/123?utm_term=strategic+thinking+test+pdf
    • https://waferipesor.weebly.com/uploads/1/3/5/3/135307907/wamoj.pdf
    • https://rogejizerabori.weebly.com/uploads/1/3/4/7/134763318/2050118.pdf
    • http://lanufutado.22web.org/good_character_traits_list.pdf
    • https://cdn.sqhk.co/rufosopufu/2TShdib/ganugiderajuvexolugavap.pdf
    • https://lipuxavevafip.weebly.com/uploads/1/3/1/3/131398459/6460944.pdf
    • https://cdn.sqhk.co/vufisolepu/hehhie9/83222999889.pdf
    • https://cdn.sqhk.co/zogobadakedu/Bjjjj1B/80188282450.pdf
    • https://cdn.sqhk.co/daxerarugak/bjemZhi/gorezefugabikewitewizitub.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.opentle.org
    • https://s3.amazonaws.com/buponuwebi/iso_metric_bolt_size_chart.pdf
    • https://ab2ac9d4-4772-4872-829d-c19fde0a4f90.filesusr.com/ugd/b919b3_af4d7b9c95694c419c4204f67760905c.pdf?index=true
    • https://s3.amazonaws.com/kelageketisefuv/75232644550.pdf
    • https://7c5e2310-e79b-429e-9f4a-70471a43dcce.filesusr.com/ugd/8ec1ef_32ea5573c1bc45748a643b83bc2b1177.pdf?index=true
    • https://459ec6dd-5b69-4322-a182-74abbfaa0e48.filesusr.com/ugd/221eaa_c0d9d1175feb422cbb4b10b52e72e01b.pdf?index=true
    • http://zifezerolivuba.epizy.com/86483467027.pdf
    • https://s3.amazonaws.com/fizufapu/why_did_my_rock_candy_not_work.pdf
    • https://45f91bdd-2b68-4e60-ae2c-b14373ae5332.filesusr.com/ugd/0d089b_a03cd426658f4fc489f3ed35568d78df.pdf?index=true
    • https://da550aaf-34ae-4f9b-ad82-7836b82beebe.filesusr.com/ugd/a203e6_037ad6327128432399742ddca2a70edb.pdf?index=true
    • https://2b81f3f0-3f46-42ff-87a7-5865dd96cd3c.filesusr.com/ugd/fb41f9_0d3dc9e8065a4adab55f56232fde979e.pdf?index=true
    • https://11ab4cf5-156d-4417-99e9-5039b2a7eb5f.filesusr.com/ugd/82d61e_dac7e13a53bc43ae99ee7983d0da8fd6.pdf?index=true
    • https://091a8774-b5bd-4fb7-8799-8d1ca0ca44ad.filesusr.com/ugd/8716ab_664fe5bdfc9b4c93bbf715b358089680.pdf?index=true
    • http://bofozavo.rf.gd/template_employee_contract.pdf
    • https://b962d5b8-8819-42e3-9ba3-d95e8366760e.filesusr.com/ugd/f51585_070259a3631b49b9b4af949329ad3509.pdf?index=true
    • http://batogejupimole.rf.gd/zudalov.pdf
    • https://s3.amazonaws.com/mexesazaxasa/buku_agama_islam_kelas_12.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://www.gnu.org/licenses/gpl.html

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011247.bin
6255eb2a89778ad7966c1b495cb33d0b92963b4eba98bc059ef6a593da073bad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11247 5552 bytes
font_01_sfnt_off00012519.bin
ab709cf5dc6fc38074c08342c9cf21cc86119bb13ee2e619092e91b2c6961faf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12519 7624 bytes
font_02_sfnt_off00013a04.bin
9b1d53a8656f270feae647d6e0b1250eb61834932a28fbe1b400dbeff345dd74		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13A04 11056 bytes

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