Malicious PDF — malware analysis report

Static analysis result for SHA-256 71229197fb05bfaf…

MALICIOUS

PDF

75.3 KB Created: 2021-02-21 06:42:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 023a65f88b9c2630ce986e011a4481b1 SHA-1: b7a8fea054b66ad44418ce0638d308a6ea1499d7 SHA-256: 71229197fb05bfaf5e4f920e7a494014cdf383c71e061f2d19f182008fa5aeb7
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, a common tactic for distributing malicious content or conducting phishing campaigns. Heuristics indicate a link farm on disposable hosting, and ClamAV detected it as a phishing trojan. The ML classifier also strongly indicated maliciousness.

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.
  • 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.
  • 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://bologen.ru/123?utm_term=nashville+number+system+worship+songs PDF link annotation
    • https://cdn.sqhk.co/joxezexukub/hhicVhj/91318272077.pdfIn PDF document text
    • https://sarajifig.weebly.com/uploads/1/3/2/7/132710715/e35b6.pdfIn PDF document text
    • https://varepanuror.weebly.com/uploads/1/3/5/3/135394497/53bf12b40.pdfIn PDF document text
    • https://pusuranan.weebly.com/uploads/1/3/4/5/134598414/0f714.pdfIn PDF document text
    • http://wesaremujoworu.22web.org/gateway_audio_bible_niv_dramatized_psalms.pdfIn PDF document text
    • https://cdn.sqhk.co/lanumakefu/5PslgeG/flex_duct_flow_rates.pdfIn PDF document text
    • https://cdn.sqhk.co/vefasebo/Gmifggd/red_sun_with_16_rays_tattoo.pdfIn PDF document text
    • https://cdn.sqhk.co/winelolibug/ibhhDie/aaron_donald_draft_class.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427268/normal_601ba1f9507ff.pdfIn PDF document text
    • http://duduzojezojak.22web.org/87253373418.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://dumizalu.epizy.com/social_contract_definition_in_hindi.pdfIn PDF document text
    • https://s3.amazonaws.com/lezopobigeza/arma_3_activation_key.pdfIn PDF document text
    • http://pibasas.epizy.com/audit_report_format_for_sole_proprietorship.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxutedi/bade_acche_lagte_hain_ringtone.pdfIn PDF document text
    • https://s3.amazonaws.com/pilazi/nstemi_guidelines_executive_summary.pdfIn PDF document text
    • http://nabesazuxipuf.epizy.com/template_ppt_tema_sejarah_indonesia.pdfIn PDF document text
    • http://kofufinaniba.rf.gd/debitepejosimaguge.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB03 5476 bytes
SHA-256: 6c8e141303d074361acdd26e00f9dcf84b18218cce5cedf62e4f6a96e83a54a0
font_01_sfnt_off0000ed8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED8A 10684 bytes
SHA-256: bfda6f16227e113d7f2ccddc32bd3155a25cd2163059eaf340267fbe487a1b36
font_02_sfnt_off00011229.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11229 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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