Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b13f432c31c2f0b…

MALICIOUS

PDF

71.0 KB Created: 2021-03-16 17:50:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 22b197bcf8c830aff6d66fefcda5570f SHA-1: 7b7e347bc695a81a2377cb404090d59d979bf344 SHA-256: 7b13f432c31c2f0b6e0f6b3c7b1549d1413b7671066d5767776f726852f15d5b
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for link farms or phishing lures, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious content, likely for further exploitation or credential harvesting.

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://pelibifir.ru/wix?keyword=fruit+loop+graphing+worksheet
    • http://vodabezoli.iblogger.org/goodnight_moon_eric_whitacre_sheet_music.pdf
    • http://newoxoxi.mywebcommunity.org/67609771986.pdf
    • https://jovinafunen.weebly.com/uploads/1/3/2/6/132695325/konugazew-zefivat-fawufipu.pdf
    • https://tirokaroxere.weebly.com/uploads/1/3/2/7/132740449/mogoxusoduganotus.pdf
    • http://taxokisekajetek.22web.org/jquery_ajax_submit_form_post.pdf
    • https://woronawupewusor.weebly.com/uploads/1/3/4/6/134672267/8462148.pdf
    • http://wasegulom.mygamesonline.org/lcm_and_hcf_worksheet_for_grade_4.pdf
    • https://jakemujilofadam.weebly.com/uploads/1/3/1/3/131380171/9371105.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/navoburarovada/gapodenowi.pdf
    • http://sijukote.rf.gd/lirokepivewedi.pdf
    • http://pexefenebize.epizy.com/27306917219.pdf
    • https://s3.amazonaws.com/sazomo/block_mini_world_mod_apk.pdf
    • https://s3.amazonaws.com/levumoduf/apertura_piriforme_maxilar.pdf
    • https://s3.amazonaws.com/janodojivi/genetics_information_sheets.pdf
    • https://49884795-3b66-401c-adaf-b59e999553af.filesusr.com/ugd/8bd6c9_3306356b5efa4b9cb6808d153987f8a3.pdf?index=true
    • https://a72a44ae-2aae-4d6a-a6c4-235301d0a62e.filesusr.com/ugd/57436b_490b6d05843049c898f0f90ab71a6006.pdf?index=true
    • https://cda84be5-0c54-4c05-8389-97bb004c798d.filesusr.com/ugd/fa9f00_905c7da7248e474c8e8837b5a9f60770.pdf?index=true
    • https://3c45aaf8-24f3-4cde-9773-cf44a0a970d3.filesusr.com/ugd/ae7d54_56dd46c2ec064ecea863664e5d195c98.pdf?index=true
    • http://tagitefidunun.epizy.com/majhi_naukri_ssc_mts_answer_key.pdf
    • https://0aa989e7-076c-475f-bc22-fff5ae310860.filesusr.com/ugd/b44be6_697f24044d194ecf82854494df04b512.pdf?index=true
    • 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_off0000d87e.bin
29b2a26713a060744e6a95c6298a3ae9bd071109491cb887fca18dfea1eb7df7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD87E 5192 bytes
font_01_sfnt_off0000ea3b.bin
f49b4caab31693c11b1f4e17a88c047416d0ec64c12ff0c49a55196b681004a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA3B 10648 bytes

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