Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d165c396da93e7f…

MALICIOUS

PDF

69.4 KB Created: 2021-02-21 10:12:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: a0c18fdab74b4fe5e3365667bf865fcc SHA-1: dc4061812e76c475a77eed915e29175749ff4591 SHA-256: 1d165c396da93e7fb9c2d7b590af6a66e048fffcd6a0cfa37d32cc9eadb9932c
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified as a link farm, with the primary URL pointing to a page about increasing calculation speed for bank exams. This suggests a social engineering tactic to lure victims to potentially malicious websites. ClamAV and ML classifiers also flagged the file as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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=how+to+increase+calculation+speed+for+bank+exams PDF link annotation
    • https://dedotomonifagax.weebly.com/uploads/1/3/1/6/131606429/zalediluro.pdfIn PDF document text
    • http://world-wild-shop.com/96606362758ifg8k.pdfIn PDF document text
    • https://popajilosofov.weebly.com/uploads/1/3/0/7/130776408/e42efea96090f9b.pdfIn PDF document text
    • http://circleshtang.xyz/wasopusesonubazuzibogawp3.pdfIn PDF document text
    • http://xupevagadozojad.22web.org/las_bacterias_coliformes_totales.pdfIn PDF document text
    • https://baxezakeva.weebly.com/uploads/1/3/1/4/131406046/1906e80fec.pdfIn PDF document text
    • http://faxadiweruxu.22web.org/84076789572.pdfIn PDF document text
    • http://megahit.space/3880523370izxr2.pdfIn PDF document text
    • https://lugilalosu.weebly.com/uploads/1/3/4/3/134314137/fegog_wamen_xojozokixij_javopigapixifu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fujadabez/fovaziwepimasosiweg.pdfIn PDF document text
    • https://s3.amazonaws.com/jajuzasalikirut/80887740439.pdfIn PDF document text
    • https://s3.amazonaws.com/gulapore/mlb_trade_rumors_giants_bleacher_report.pdfIn PDF document text
    • https://s3.amazonaws.com/rekawexuretowo/cracked_vpn_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/muwomapotumugi/colbert_report_stone_phone.pdfIn PDF document text
    • https://s3.amazonaws.com/vebogotexaf/23603651681.pdfIn PDF document text
    • https://s3.amazonaws.com/gidibesuxi/23140250863.pdfIn PDF document text
    • https://s3.amazonaws.com/woberiz/sadanavagiwivunapolubel.pdfIn PDF document text
    • http://sifebina.epizy.com/negiz.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF84 5624 bytes
SHA-256: 2f847980b5c1987dd6f48163aa4066cb051355cb617b66ff5db3e23502d0fc12
font_01_sfnt_off0000e2a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A3 11112 bytes
SHA-256: 97eb5f2ca1d9d4eb847dac21e09f7e74756467cc705e8481a56a6003625baf1a

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