Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdae9ba39fcf5e7e…

MALICIOUS

PDF

74.6 KB Created: 2021-02-23 04:19:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: d30dc35a43ff24d521cf8f1f7512cf30 SHA-1: 164d4fb393e7427b842e2056c6a5c21d79ccf0d8 SHA-256: cdae9ba39fcf5e7e1f4401097122cf39311523a68d7ce33255c9671b8357e37a
156 Risk Score

Malware Insights

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

The PDF file contains a lure related to interview questions for a desktop support team leader, which is a common social engineering tactic. It also contains a large number of external links, many of which are suspicious, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution via the embedded links.

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://maypoin.ru/strik?utm_term=interview+questions+for+desktop+support+team+leader PDF link annotation
    • http://erse.xyz/made_in_chelsea_croatia_episode_guidedcn5l.pdfIn PDF document text
    • http://qrettalq.online/juwumagemusilufirugopsxdrq.pdfIn PDF document text
    • http://instapriz24.site/cupcake_jemma_macaron_templatezsrks.pdfIn PDF document text
    • https://janodiwuzujemux.weebly.com/uploads/1/3/1/3/131382133/finulotuku-limopuveze.pdfIn PDF document text
    • http://befigter.xyz/dapurulrd2.pdfIn PDF document text
    • http://hookup154.site/natizizerokunetadquio.pdfIn PDF document text
    • https://kasipuxatupar.weebly.com/uploads/1/3/5/9/135966953/890844.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
    • https://s3.amazonaws.com/dezajok/cambridge_audio_azur_dacmagic_plus_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/pukaridimupo/52803928385.pdfIn PDF document text
    • http://vinetewexe.epizy.com/39387365630.pdfIn PDF document text
    • https://s3.amazonaws.com/bomupi/92509032216.pdfIn PDF document text
    • https://s3.amazonaws.com/pevarijidasalop/35036331163.pdfIn PDF document text
    • https://s3.amazonaws.com/mexijegedakol/aiaa_scitech_template.pdfIn PDF document text
    • https://s3.amazonaws.com/vonutavekip/petta_movie_annamalai_remix_bgm.pdfIn PDF document text
    • https://s3.amazonaws.com/rejiner/96563891744.pdfIn PDF document text
    • https://s3.amazonaws.com/nelizenejakarug/70714098298.pdfIn PDF document text
    • https://s3.amazonaws.com/mawesenasijoser/passport_photo_template_printable.pdfIn PDF document text
    • http://fidepogomuvi.rf.gd/pancreatitis_aguda_signos_y_sintomas.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_off0000dc79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC79 5348 bytes
SHA-256: 401d91c0a5b04fc645e152ef2c9689edaba7c618a077bf4ba2bee568b3f45a20
font_01_sfnt_off0000eea3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA3 9352 bytes
SHA-256: 0b19beeb7c15c63be26d9b5fbdaf127d7a66058d5dcdec8384a252449a6e4cb4
font_02_sfnt_off00010ea2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA2 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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