Malicious PDF — malware analysis report

Static analysis result for SHA-256 9353bb1277fcd4c7…

MALICIOUS

PDF

72.6 KB Created: 2021-02-22 00:41:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: fdfd60a3966972494a764812ad986737 SHA-1: 6d3ed657112874e69e7d143c1d47d16d5d1f47cf SHA-256: 9353bb1277fcd4c74cb9b2c3b54fb293aaac39ec42754b606755b3cc3605600e
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains embedded URLs, one of which is `https://crophysi.ru/strik?utm_term=a+raisin+in+the+sun+test+answer+key`, suggesting a phishing lure disguised as a test answer key. The presence of multiple external URIs and a link farm heuristic indicates a strong intent to redirect users to malicious sites.

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 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://crophysi.ru/strik?utm_term=a+raisin+in+the+sun+test+answer+key PDF link annotation
    • http://reactivascotia2020.com/fexonagutas62.pdfIn PDF document text
    • https://gimituwemowi.weebly.com/uploads/1/3/4/8/134872285/regeretelir_dokizuvugiw_joxir_xikazerupebena.pdfIn PDF document text
    • http://salestore.pro/836910476502p9mj.pdfIn PDF document text
    • http://xtw2.club/susopuzigowuvom7ycbo.pdfIn PDF document text
    • http://goodsfor.life/computershare_brighthouse_formsgagh1.pdfIn PDF document text
    • https://wumigativagulam.weebly.com/uploads/1/3/1/6/131637174/715454c9b59b4.pdfIn PDF document text
    • http://reduslim-shop.website/55313760684n1ik.pdfIn PDF document text
    • http://reduslim-ordina.site/enunciation_exercisesnf8od.pdfIn PDF document text
    • https://fugunukotuji.weebly.com/uploads/1/3/4/5/134589730/8166104.pdfIn PDF document text
    • https://dakikizubebara.weebly.com/uploads/1/3/4/8/134889455/vuwofunovofo.pdfIn PDF document text
    • https://cdn.sqhk.co/sewadokoka/lq8jiRL/botexejas.pdfIn PDF document text
    • http://wellwork.site/pay_it_forward_2000_movieqn9c7.pdfIn PDF document text
    • https://cdn.sqhk.co/ranofakon/RhEgjd6/32244864189.pdfIn PDF document text
    • https://cdn.sqhk.co/xiselaza/m1ghBid/48937314598.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/nafibanefexex/wow_herbalism_guide_mop.pdfIn PDF document text
    • http://bitugoxopezuwu.rf.gd/woradexunukom.pdfIn PDF document text
    • http://gofabudif.epizy.com/how_to_scan_multiple_pages_on_epson_xp-320.pdfIn PDF document text
    • http://fufibilola.epizy.com/skype_meetings_app_windows_7.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE63 4988 bytes
SHA-256: b096e6b2417beadc43e68071030c2d81906a8bb90197b4e018d092747e09492e
font_01_sfnt_off0000ef67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF67 11440 bytes
SHA-256: 3eff778bd4822bd40ffbd52f010267ffc1e9433e3ea542dd38b471f1d6492c97

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