Malicious PDF — malware analysis report

Static analysis result for SHA-256 cea33262d7048287…

MALICIOUS

PDF

84.3 KB Created: 2021-06-02 05:06:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 0258487c80c60d679cbdff03101c363c SHA-1: 41fedc1c26bc98eaa1063cb962045299c4223e7e SHA-256: cea33262d70482878840a8d260d94faa59921aca24b6fcc24ee5d92ef7f71c32
194 Risk Score

Malware Insights

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

The PDF file contains a large number of external links pointing to disposable hosting, indicative of a link farm designed to redirect users to malicious sites. The presence of a 'download button' lure further supports a malicious intent. ClamAV detection and ML classification confirm the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://smidgel.ru/pbw?utm_term=theme+from+schindler%2527s+list+violin+sheet+music+imslp PDF link annotation
    • https://toruruxixe.weebly.com/uploads/1/3/4/6/134698343/4909885.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374839/normal_60187bd1d4e36.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405194/normal_5fcf04b20b985.pdfIn PDF document text
    • https://takisulajedeviv.weebly.com/uploads/1/3/7/5/137501155/fovojiwasanogom.pdfIn PDF document text
    • https://lomewulepizava.weebly.com/uploads/1/3/3/9/133999744/kefiwixetazalaxijeni.pdfIn PDF document text
    • https://menanolunum.weebly.com/uploads/1/3/4/7/134754058/kilut.pdfIn PDF document text
    • https://rudazolabogufaj.weebly.com/uploads/1/3/4/7/134772206/ca70c6bc32d55d7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420036/normal_605f5a44018e1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380681/normal_6046205f67616.pdfIn PDF document text
    • https://larulevi.weebly.com/uploads/1/3/6/0/136004384/xurisenim.pdfIn PDF document text
    • https://kevefizi.weebly.com/uploads/1/3/1/8/131871405/c6b6c006.pdfIn PDF document text
    • https://givozerav.weebly.com/uploads/1/3/2/7/132710596/gubumurewexo-pojijajuvapil.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://joxupakager.pbworks.com/w/file/fetch/144488679/xibiko.pdfIn PDF document text
    • http://foziwedugumu.pbworks.com/w/file/fetch/144465387/everyday_spelling_grade_6_answers.pdfIn PDF document text
    • http://niwomif.pbworks.com/f/what_is_dua_e_qunoot.pdfIn PDF document text
    • http://guronavageba.pbworks.com/f/tadepeledotujemepudenomo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45844f0e-1c98-4bef-b67a-70ce92bd4671/88738459423.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e48bb632-dc1f-4895-b768-4f311f83e599/87327444155.pdfIn PDF document text
    • http://nusuwoxub.pbworks.com/w/file/fetch/144414018/72811182760.pdfIn PDF document text
    • http://gonumutat.pbworks.com/w/file/fetch/144487416/gufabidijafamalozum.pdfIn PDF document text
    • http://munonoraze.pbworks.com/f/algebra_2_lesson_10a_worksheet_direct_inverse_and_joint_variation_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1451e86e-d423-473a-bdb1-476b1270e883/xovurikatuliditez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d52db39-dddf-403c-9dd9-48c0be3cb0bc/90260127941.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1acdafd5-11e0-470a-a6d1-36b2e57dc633/58290103417.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A0 6536 bytes
SHA-256: c10938f23b3148a2b10b883b1b54d5872a143c900d879c806034b260b32aa5f2
font_01_sfnt_off0000f6ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6CA 5228 bytes
SHA-256: 2cc4d5ce8bfcff82e137ab44d29e1ab9c1e7cb0850a7423fb0eadcc2147632b4
font_02_sfnt_off00010873.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10873 5380 bytes
SHA-256: b5189907c4563c6ac3f1f9f83aff629e36f33f0aedb02c2034cb91e83a4007d6
font_03_sfnt_off00011b25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B25 11624 bytes
SHA-256: a37176f55d181d430f59d13749abe361b53137c99a4d8979dbb7f4924ab76e96