Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5a015a7b6be4730…

MALICIOUS

PDF

81.0 KB Created: 2021-03-29 05:05:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8025c63c5e08395456908fb62b42d088 SHA-1: dd64dc5c216fc206046aa805e1459af072880d4e SHA-256: e5a015a7b6be4730f5a22b106b8b0be60b48baf002defd1f08946135bbf30a16
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many of which are part of a link farm designed to manipulate search engine results. The document body, though heavily obfuscated, suggests a lure related to 'Antecedentes de diabetes pdf'. The presence of embedded URLs and the overall structure indicate an attempt to redirect users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://resalured.ru/award?keyword=antecedentes+de+diabetes+pdf
    • http://xafesuvorolivig.scienceontheweb.net/how_to_connect_hp_deskjet_3050_to_wireless.pdf
    • http://banademebilite.sportsontheweb.net/89135953782.pdf
    • http://katipef.medianewsonline.com/vedezosavibozenawetalosi.pdf
    • http://kuzexamipapoxip.medianewsonline.com/for_the_first_time_piano_sheet_music.pdf
    • https://mitegasur.weebly.com/uploads/1/3/1/8/131871816/digepigedawojutazupa.pdf
    • http://jilavixit.medianewsonline.com/27997635368.pdf
    • https://moxudoged.weebly.com/uploads/1/3/3/9/133999753/zudajogesotudu.pdf
    • https://wefizaxire.weebly.com/uploads/1/3/0/9/130969527/najipuwexovaru_pewibodomi_kodaxizuvil_xufur.pdf
    • https://zuzigomotof.weebly.com/uploads/1/3/4/8/134889908/c21db.pdf
    • http://kelimap.mywebcommunity.org/order_of_adjectives_in_english.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://f59c0a4d-c104-43ac-8966-a5978cdf1b8c.filesusr.com/ugd/0c1ebd_c7aa55633d6d4ceda051b68ab35f5457.pdf?index=true
    • https://044e8d80-c429-4a1f-820d-9b443c65b389.filesusr.com/ugd/53c654_f261d75b927a4d04ba9c95940cb73c71.pdf?index=true
    • https://s3.amazonaws.com/lerezazo/46454231145.pdf
    • https://f8340159-69ce-4309-ac43-521e9a8475b4.filesusr.com/ugd/bc0b97_361530c4ad0c4d09985fc739f2497582.pdf?index=true
    • https://s3.amazonaws.com/najubu/annapurna_trek_self_guided.pdf
    • https://s3.amazonaws.com/midaguvimabof/99752318448.pdf
    • http://josuxak.atwebpages.com/jurnal_bani_abbasiyah.pdf
    • https://s3.amazonaws.com/vazisi/sekoxegelewemisirutepodad.pdf
    • https://s3.amazonaws.com/wopari/6794209420.pdf
    • https://de2a8dfc-dc8d-4d62-be3b-f97abdd17bf6.filesusr.com/ugd/c722c2_1d78fc7be7954adabc334cd4c3729919.pdf?index=true
    • https://2a07c75e-e898-48ba-b326-4cccc82d0599.filesusr.com/ugd/ff154e_7d1cb89f78d1480f9dfd25e44294674c.pdf?index=true
    • https://bf5f3f24-cfb9-4aec-9f01-83e6d863dc5b.filesusr.com/ugd/1f4526_34763427cd9a411981c31f23e7701de7.pdf?index=true
    • https://ea29520f-fefa-4c12-ab21-0e0839e82572.filesusr.com/ugd/5d2047_3d5789f0fd07402aadaa7effe5642457.pdf?index=true
    • https://d3dd75b0-514a-4dbf-a1f7-973a5b421fb1.filesusr.com/ugd/5b46ec_ea792ae8817b4ac59b7dee54bcac609e.pdf?index=true
    • https://d6236f05-450e-4b96-9875-1783d83c708b.filesusr.com/ugd/912de2_722be913250d4a0f8a279c0804a57796.pdf?index=true
    • 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fcd6.bin
be170f6600095e9d311afac33fee30c85ed76b3910ccb3ed994afe8de69962f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD6 5148 bytes
font_01_sfnt_off00010e6f.bin
ed62a8c472c54a8ab0c7bf4d97072c115e49fb5f6f0fc4efd9b3237487c30fc5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E6F 12076 bytes

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