Malicious PDF — malware analysis report

Static analysis result for SHA-256 f61bbeb230ff9aef…

MALICIOUS

PDF

102.6 KB Created: 2021-01-21 04:17:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: a8e91d1b5a2992e1b2fca239e4db6293 SHA-1: 4391b25d1d0d9e6000bda012d9de77f3e1bd0ed4 SHA-256: f61bbeb230ff9aef94f9924ea6c0eb3b878f122665b270c4934fa1a23f68b3ab
216 Risk Score

Malware Insights

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

The sample is identified as malicious by multiple heuristics, including ClamAV and an ML classifier, and is flagged as a brand-impersonation credential phishing lure. The PDF contains external links, one of which leads to a Weebly hosted URL that is likely a phishing redirector. The document body is heavily obfuscated and unreadable, but the presence of external links and the phishing heuristic strongly suggest a credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://vutameko.weebly.com/uploads/1/3/4/5/134576445/xiruzug-totezodudi-fewaroziwad-kuwivosonez.pdf.
  • 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://trafffe.ru/123?utm_term=crusader+kings+2+immortal+trait+id PDF link annotation
    • https://vutameko.weebly.com/uploads/1/3/4/5/134576445/xiruzug-totezodudi-fewaroziwad-kuwivosonez.pdfIn PDF document text
    • https://site-1213673.mozfiles.com/files/1213673/8349670983.pdfIn PDF document text
    • https://site-1178803.mozfiles.com/files/1178803/hearts_fc_stadium_seating_plan.pdfIn PDF document text
    • https://cdn.sqhk.co/boketumejipa/ptCjibU/paypal_account_limited_how_long_to_resolve.pdfIn PDF document text
    • https://site-1177405.mozfiles.com/files/1177405/castle_wreck_level_58.pdfIn PDF document text
    • https://cdn.sqhk.co/zowipitilo/Z5jcvr0/misugetekeregapegexupexi.pdfIn PDF document text
    • https://site-1181071.mozfiles.com/files/1181071/gedokumotizaxojavevopuxo.pdfIn PDF document text
    • https://site-1188816.mozfiles.com/files/1188816/wolf_wallpaper_phone.pdfIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jujadodedaruxix/81057207095.pdfIn PDF document text
    • https://s3.amazonaws.com/ditiruz/40285629850.pdfIn PDF document text
    • https://s3.amazonaws.com/ruzaganog/apa_citation_and_referencing_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/gulapore/ain_t_your_mama_song.pdfIn PDF document text
    • https://s3.amazonaws.com/tupofelasujewas/98827382038.pdfIn PDF document text
    • https://s3.amazonaws.com/jikopot/64310540921.pdfIn PDF document text
    • https://s3.amazonaws.com/legenapi/zorimodigim.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://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00013d46.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x13D46 15240 bytes
SHA-256: 5fec3e06d15543c4f627c3ad071f24322876805451afd90188f3e95a39d8d868
font_00_sfnt_off00012b8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B8F 5248 bytes
SHA-256: 89cccf4be5c59de6ecb33bba6b3493af0e62ea74fe8466a159a1c9e29252d8fe
font_02_sfnt_off00016745.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16745 10960 bytes
SHA-256: 58d38088736fd6a1dc8d70c73872901dc811873e193070666612d89dd05c749e

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