Malicious PDF — malware analysis report

Static analysis result for SHA-256 55b2172a84c0fb16…

MALICIOUS

PDF

82.2 KB Created: 2021-02-20 02:35:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: dd9be6d21f0dd450d8c886172fe0666b SHA-1: 8500e17c507d0865059084c11c8bbe03a644aa4b SHA-256: 55b2172a84c0fb1640ffb9ee393add89061573e17655267d5e00c4fb280ea3c5
214 Risk Score

Malware Insights

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

The PDF contains a link farm designed to redirect users to malicious infrastructure, as indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' heuristics. The embedded URL 'https://crophysi.ru/strik?utm_term=how+to+use+up+mint+jelly' is flagged as malicious. Although no scripts were explicitly extracted, the nature of the link farm and the ClamAV detection suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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=how+to+use+up+mint+jelly In PDF document text
    • http://pezisafepogux.22web.org/lagu_rohani_chrisye_damai_bersamamu.pdfIn PDF document text
    • https://cdn.sqhk.co/lamiwifa/ihc2jjb/vida_sana_saludable_consejos.pdfIn PDF document text
    • https://wekakukuzibeli.weebly.com/uploads/1/3/4/0/134000436/9196413.pdfIn PDF document text
    • https://mumilupoj.weebly.com/uploads/1/3/5/3/135351188/vadenatibodaxalivavi.pdfIn PDF document text
    • https://wavoxodasamemat.weebly.com/uploads/1/3/5/3/135348105/e0b9fd6dbb5b6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://s3.amazonaws.com/rekawexuretowo/risk_of_rain_2_ost.pdfIn PDF document text
    • https://s3.amazonaws.com/zodawanuror/audit_trail_report_template.pdfIn PDF document text
    • https://s3.amazonaws.com/numunenoji/adda247_apk_file.pdfIn PDF document text
    • https://s3.amazonaws.com/guxosa/89713665786.pdfIn PDF document text
    • http://navozilapeso.epizy.com/avidemux_2._6_32_bit.pdfIn PDF document text
    • http://suvowafavij.epizy.com/coliformes_totales_definicion.pdfIn PDF document text
    • http://sukepavudopuje.epizy.com/coleman_powermate_generator_1850_watts.pdfIn PDF document text
    • https://s3.amazonaws.com/wonumafubij/medical_laboratory_equipment_and_their_uses.pdfIn PDF document text
    • https://s3.amazonaws.com/pululusodogi/bozodobi.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00011818.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11818 16716 bytes
SHA-256: 42d26acca491ee87a5cb7fb3cc1a2a4eb6be48b148d2fab6037334d3338282bb
font_00_sfnt_off0000d043.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD043 4888 bytes
SHA-256: 3b2de7cd4a238e79bfe558405b3433a86532893347455b831e5a9e93faa7b192
font_01_sfnt_off0000e0ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0EC 4436 bytes
SHA-256: 668d5fdc530a05900ef4b2d307b1a91074352eadbc0685d7fc7337ec470ad6f4
font_02_sfnt_off0000ef2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2F 12376 bytes
SHA-256: d89aeb2bce83056479e02c3f4c52032b5c4e2143767d4067ca881442d4236732
font_04_sfnt_off00012fa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FA1 2796 bytes
SHA-256: 55922f14165d5298d925b2890341b98835ec28c0481b6251bb75c9f4af22da85

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