Malicious PDF — malware analysis report

Static analysis result for SHA-256 c911a489b255cc89…

MALICIOUS

PDF

82.4 KB Created: 2021-03-24 10:40:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 18fa2271b82a319b1ca453ac357be942 SHA-1: d7b1d9a5afe1f85a544a5333e3c18ee36ee52e3c SHA-256: c911a489b255cc89aa6c60ea79c6b7a108a40f709f82f62d836e111fea221770
164 Risk Score

Malware Insights

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

The PDF contains a large number of external links, indicative of a link farm or phishing attempt. The heuristic 'PDF_SEO_LINK_FARM' and the presence of multiple unknown reputation URLs strongly suggest malicious intent. The ML classifier also flagged this PDF with high confidence, supporting the assessment of maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://jacksth.ru/strik?utm_term=why+do+i+have+really+long+arms
    • https://cdn.sqhk.co/kitolitik/jjjh9ig/avant-_courier_high_speed_rc_racing.pdf
    • https://cdn-cms.f-static.net/uploads/4404107/normal_5fd181135b6f5.pdf
    • https://giduzuzetedeze.weebly.com/uploads/1/3/4/8/134853145/pumel.pdf
    • https://cdn-cms.f-static.net/uploads/4490251/normal_60183d4245fac.pdf
    • https://static.s123-cdn-static.com/uploads/4381748/normal_5ff619c1b1516.pdf
    • https://cdn-cms.f-static.net/uploads/4417046/normal_5fe8492f3df10.pdf
    • https://wafulezejo.weebly.com/uploads/1/3/4/7/134748518/kotalinuloli.pdf
    • https://cdn-cms.f-static.net/uploads/4366360/normal_5fd0a70e70d8d.pdf
    • https://guxisawupejova.weebly.com/uploads/1/3/0/8/130814058/ranaxixezis-jugalibajid-ridetudosar.pdf
    • https://cdn.sqhk.co/pixorikibam/egeA6jf/deleze.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://91c7bc9f-df77-4dbd-ae51-8bcf521f3e61.filesusr.com/ugd/1df9ea_261905beb00846bcaac1c9ec395dcdf6.pdf?index=true
    • https://43fe4710-460a-4ad3-90dc-2dd795c51528.filesusr.com/ugd/a32c20_4f6f5cba56144527b02087e779186808.pdf?index=true
    • https://s3.amazonaws.com/savukojubusum/xixifuwobirekoliririxuna.pdf
    • http://jofesosozofoso.epizy.com/12274497620.pdf
    • https://cccd2283-d272-450a-840b-6541230ebad2.filesusr.com/ugd/5de1df_699accfec74042719856a904af5b3cbc.pdf?index=true
    • http://bumojito.rf.gd/99543039738.pdf
    • https://s3.amazonaws.com/mubemutolewe/17559519760.pdf
    • https://1dab3517-3db0-43ff-9fd6-b65b51f65b60.filesusr.com/ugd/565485_d5b86573b0834ad1a284035b3aef8f81.pdf?index=true
    • https://s3.amazonaws.com/rujabepifar/71976349057.pdf
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f69e.bin
60bb6eb64fa13e620add39643a7aa6982b7ad3c5deab847c1d4d56efeb63738a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF69E 5120 bytes
font_01_sfnt_off000107e6.bin
fdaa47a143e0ddf30d79f6df98d307431faa735396a579d721361b3569fa8ec8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107E6 11284 bytes
font_02_sfnt_off00012e13.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12E13 4324 bytes

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