Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b330838c2852dfd…

MALICIOUS

PDF

77.8 KB Created: 2021-03-14 02:46:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3a5759c9e3f11464edc61ec2d831e8a2 SHA-1: d02ef11ea678fe929377327c6c9a9fdd2c7200ca SHA-256: 0b330838c2852dfd0bf37977f4d0892b0d56489fbd9f7f33cea6b34bdad08636
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to domains designed to mimic search results or provide seemingly legitimate content, a common tactic for phishing or distributing further malware. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or trojan delivery. No scripts were extracted, but the PDF structure itself facilitates the attack by hosting numerous external URIs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://vilenefex.ru/award?keyword=caquexia+definicion+pdf
    • http://metarapuw.mypressonline.com/crossfire_miniature_rules.pdf
    • http://italysummer.space/462039283103peyg.pdf
    • http://fortuneocredit.com/wemilukonitmsecs.pdf
    • http://cabinetshq.xyz/diary_of_a_wimpy_kid_deep_end_lexile_levelgrr1e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://c183b790-cb34-49aa-848e-1a9f2b14dda3.filesusr.com/ugd/d8966e_b8d9a2488591456394c2eb6c107ea88e.pdf?index=true
    • https://s3.amazonaws.com/lupebesu/12671912685.pdf
    • https://02e0da19-eac5-4521-950b-4e410541bf1c.filesusr.com/ugd/516249_5570d86de27141478ae4874415b31260.pdf?index=true
    • http://zipemoluligera.myartsonline.com/gerajiviligipoz.pdf
    • https://s3.amazonaws.com/rumezo/mailjet_api_template.pdf
    • https://80c8fd16-4cf8-4f9f-b52b-d6c956df8f3b.filesusr.com/ugd/1a94e8_78ddda9b598e44f592cbffb374fc95ab.pdf?index=true
    • https://s3.amazonaws.com/migivewuwe/salesforce_lightning_design_system_developer_guide.pdf
    • https://s3.amazonaws.com/purixifusipelid/chrome_os_linux_for_pc.pdf
    • https://s3.amazonaws.com/kuxuxemu/cricket_captain_2019_android.pdf
    • https://s3.amazonaws.com/fajujiju/weather_report_lennoxville_quebec.pdf
    • https://s3.amazonaws.com/nitizobuv/brother_cs-6000i_e1_error.pdf
    • https://s3.amazonaws.com/kiguteperilodu/pediatric_lyme_disease_treatment_guidelines.pdf
    • https://s3.amazonaws.com/pasawexawinogad/dupisedefo.pdf
    • http://wojibikifi.myartsonline.com/how_to_read_music_note_for_guitar.pdf
    • https://s3.amazonaws.com/fonazuzixagizir/8494258181.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f20d.bin
a17f2e26bb512d78644595d8269c6a09077b7bc452faec87b1937c910be7982e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF20D 4944 bytes
font_01_sfnt_off000102fc.bin
ec0094996c55bd74571926b21f7792dcbe7773d4f75f0d1151c54d35c61c770d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102FC 10988 bytes

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