Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c23a80b179834b6…

MALICIOUS

PDF

119.6 KB Created: 2021-02-14 09:55:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 8f937845559241e5849562170bfacc69 SHA-1: 000d92b93d8748c9df6013dc04d4e82c0397b567 SHA-256: 5c23a80b179834b6289c3b9e316df30690482d18f794bf666776297da78767d6
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, with many pointing to disposable hosting services and at least one identified as a malicious redirector. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to lure users to phishing sites or download further malware. The document body is heavily obfuscated and appears to be non-readable content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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.
  • 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://yafferge.ru/wix?keyword=chemistry+light+worksheet In PDF document text
    • https://cdn.sqhk.co/zarifabidit/4igPjgE/zombie_farm_in_athens_ga.pdfIn PDF document text
    • https://burogoga.weebly.com/uploads/1/3/2/7/132740280/1d002618a9.pdfIn PDF document text
    • https://wugovaxovagebi.weebly.com/uploads/1/3/0/9/130969592/jakufixevibokaji.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456685/normal_601a19d99a7fb.pdfIn PDF document text
    • https://cdn.sqhk.co/tuvameboroke/jathhcm/innawoods_game_ios.pdfIn PDF document text
    • https://cdn.sqhk.co/sotatixorawi/jiOcztb/huntercraft_mod_apk_1._0._41.pdfIn PDF document text
    • https://wiguvebilef.weebly.com/uploads/1/3/5/3/135389097/morun_vodufiloxifu.pdfIn PDF document text
    • http://3gusevshop.website/275856916246skf7.pdfIn PDF document text
    • https://cdn.sqhk.co/gobajejuz/fjeQJF6/gujivilirosinolaxexesurak.pdfIn PDF document text
    • http://wbigs.space/55705313076m6ybw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408343/normal_601dc9e01be3a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vogojitipam.epizy.com/sinteze_istorie_academia_de_politie.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_off0001807c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1807C 5052 bytes
SHA-256: 0ad8c1e475f16b4dd2d2faac5d7b64e7b4c48bf77645b75d4149c5fbcb84df9b
font_01_sfnt_off00019196.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19196 11620 bytes
SHA-256: 5fe7e1d903598a839253aded231a88d3d2308b39137d1bc20fb37ae5d4342869
font_02_sfnt_off0001b990.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B990 16680 bytes
SHA-256: 06ffd2d5a68755d4bb52840e48b358deff8ed738baed80646a484a47b51a2c2e

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