Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c308c84adfcc1e0…

MALICIOUS

PDF

63.0 KB Created: 2021-04-06 00:36:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 73bc4ee4af6e8f7a1fd5027bd3001ca9 SHA-1: a58625fb0c9b9a060251078fc723e6241545e885 SHA-256: 7c308c84adfcc1e09501b271ff5a1af443dd95a4ba3a2872adedd6c62af6e2bd
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to potentially malicious or disposable domains, suggesting a phishing or malware distribution scheme. The PDF structure and embedded links are indicative of a spearphishing attachment used to redirect users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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/award?keyword=akuntansi+sektor+publik+mardiasmo+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4411917/normal_5fd275373fa8c.pdfIn PDF document text
    • http://1freedom.space/introduction_to_financial_accountingthlv0.pdfIn PDF document text
    • http://zusazibob.iblogger.org/dell_2001fp_lcd_monitor.pdfIn PDF document text
    • http://kukushpa.fun/55485432206lf9xo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499300/normal_605621c47672f.pdfIn PDF document text
    • http://samozanyat.info/norugaziguzapufalelomyyri.pdfIn PDF document text
    • http://mir23.xyz/can_spells_crit_pathfinderzpo1r.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383574/normal_600f05b818308.pdfIn PDF document text
    • http://pirewarekow.mywebcommunity.org/roman_numerals_1-100_copy_paste.pdfIn PDF document text
    • http://b4shop.icu/hbs_760_pairingk3ziw.pdfIn PDF document text
    • http://ruvinowuge.scienceontheweb.net/flight_of_the_bumblebee_flute_piano.pdfIn PDF document text
    • http://fruittea.space/dolozuzuwup1ak6q.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://72a23b54-95c1-47c0-80d6-f7b1310faeb8.filesusr.com/ugd/65b209_93b99ab9ad4741168ffe1a087f27965a.pdf?index=trueIn PDF document text
    • https://1801fa0f-56e4-4894-8452-b8e06651d4be.filesusr.com/ugd/868401_d5b1d06c89664c5186017ebdbedd1cb1.pdf?index=trueIn PDF document text
    • https://9afb1793-bc57-4514-bb46-74e980466609.filesusr.com/ugd/11f207_bcf02ca0dec841f49b609ff9b73666e5.pdf?index=trueIn PDF document text
    • https://4b67404f-136a-46a0-9cf3-151f2d38faab.filesusr.com/ugd/241fd5_a7ac96e411404d20964369ed7e6d398c.pdf?index=trueIn PDF document text
    • http://tovetetuw.rf.gd/la_poetica_di_aristotele_libro.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bc28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC28 5380 bytes
SHA-256: 25cc91d188b6aee6accd0080877e2eadc27ec94b8d40be0308844f7774917ec9
font_01_sfnt_off0000ce59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE59 9620 bytes
SHA-256: 5355f0987d6c9465f159382ae6671c7718e0722d4970ca07df4bf76d90f7290a

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