Malicious PDF — malware analysis report

Static analysis result for SHA-256 b770a14a3ce414e3…

MALICIOUS

PDF

84.2 KB Created: 2021-03-27 11:11:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 74c532b630a6ce6a1d1e6f7e27b9bd3c SHA-1: d280f3f952937777ff2efa83a1adb31bf5a0cc9b SHA-256: b770a14a3ce414e336777bf64cc90bc99f8072c1a68057b11dddc9e00c504270
136 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. Heuristics indicate the presence of an external URI and an SEO redirector link, pointing to 'https://ponafet.ru/strik?utm_term=cuantos+decimetros+equivalen+a+un+metro'. The document body, though heavily obfuscated, contains text related to unit conversion, likely a pretext for the malicious link. No scripts were extracted, but the overall structure and URL suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://ponafet.ru/strik?utm_term=cuantos+decimetros+equivalen+a+un+metro PDF link annotation
    • https://cdn.sqhk.co/sofizagumup/fhgFghQ/77687587948.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393348/normal_602631d99c66d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410004/normal_6043479c84ff5.pdfIn PDF document text
    • https://cdn.sqhk.co/zonigita/eRvrKnl/rowivuzimudados.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461773/normal_6006d4c653093.pdfIn PDF document text
    • https://cdn.sqhk.co/jurugaguvedu/hMcp7Uu/wudexirinuratexa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481278/normal_603c58a61809a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467915/normal_600fa40fb7864.pdfIn PDF document text
    • https://cdn.sqhk.co/rebabafa/bKHhajh/neutron_music_player_oversampling.pdfIn PDF document text
    • http://xokubenafap.66ghz.com/missoula_osprey_owners.pdfIn PDF document text
    • http://gulibej.22web.org/casio_fx-_95es_plus_manual.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450512/normal_5fd39509e9557.pdfIn PDF document text
    • https://cdn.sqhk.co/mesojofu/jc3Q9ic/lionheart_dark_moon_rpg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372967/normal_603cc08091534.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dewutexorob/how_to_file_petty_cash_receipts.pdfIn PDF document text
    • http://ribuseparunowo.epizy.com/25305970328.pdfIn PDF document text
    • http://wuwatomugexove.epizy.com/smackdown_vs_raw_2007_psp.pdfIn PDF document text
    • https://s3.amazonaws.com/zodawanuror/bowflex_pr3000_assembly_manual.pdfIn PDF document text
    • http://jodonurinifos.epizy.com/bimiwiwuparubo.pdfIn PDF document text
    • https://s3.amazonaws.com/kitakilesa/o_level_chemistry_notes_free.pdfIn PDF document text
    • https://s3.amazonaws.com/gumagabu/gta_vice_city_stories_apunkagames.pdfIn PDF document text
    • https://s3.amazonaws.com/wofaxil/23477114253.pdfIn PDF document text
    • https://s3.amazonaws.com/wovigebi/aap_guidelines_gbs_positive_mother.pdfIn PDF document text
    • https://s3.amazonaws.com/lusabifef/mifeduwovidedolodix.pdfIn PDF document text
    • https://s3.amazonaws.com/zerepuzuze/zolunorasawakopigor.pdfIn PDF document text
    • https://s3.amazonaws.com/tafogusegabomu/puvinutagenazonowam.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2DA 5176 bytes
SHA-256: d288db1e72983d4b18a696be8e4c7982d496b36f8f64a7b7270a2f149728d8f0
font_01_sfnt_off00010457.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10457 11976 bytes
SHA-256: 4272e612dd4008a52f71fc2a1bd6536dc8e9abbd6fb8fad78014a28c1a612be7
font_02_sfnt_off00012bff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BFF 16100 bytes
SHA-256: f4f5fb0209a4714c3cbdfe9b8e29dbdabffe5d2cbe58e8cc741460ff97ba63ed