Malicious PDF — malware analysis report

Static analysis result for SHA-256 651c0b9bfd8b85e5…

MALICIOUS

PDF

75.3 KB Created: 2021-03-25 08:43:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 0b493ce77711cca3ce6557289ece2c38 SHA-1: dc94c26cf4e2eba532914a554e2722f81d35e3e9 SHA-256: 651c0b9bfd8b85e5811f1d953c59e21c0244fa75023d261b4dea4f830011ce73
264 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file contains a large number of embedded links, many of which point to disposable hosting or known redirectors, indicating a link farm designed to distribute malicious content. The presence of a critical PDF_MALICIOUS_REDIRECTOR_LINK heuristic and ClamAV detection further supports its malicious nature. The document body, though heavily obfuscated, contains text related to connecting a Bluetooth device, likely a lure to entice clicks on the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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.
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
  • 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+connect+block+rocker+max+bluetooth In PDF document text
    • https://cdn.sqhk.co/fidegelotag/0gc29ge/29892126853.pdfIn PDF document text
    • http://daburus.iblogger.org/nidiborasisasidi.pdfIn PDF document text
    • https://cdn.sqhk.co/faserekino/d5HE2br/movie_edit_pro_reviews.pdfIn PDF document text
    • https://cdn.sqhk.co/waxigapo/irqChbu/video_tube_play_tube_hd_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/vakolitakap/cjchau0/36706886315.pdfIn PDF document text
    • https://cdn.sqhk.co/gajerivab/0gdigjj/d_day_invasion_utah_beach.pdfIn PDF document text
    • https://maselevajaf.weebly.com/uploads/1/3/1/3/131398143/wikirifawefar_lisof_bubotubitenuw_woganalazan.pdfIn PDF document text
    • https://cdn.sqhk.co/kulabokirow/lhfTRje/nejujevober.pdfIn PDF document text
    • http://logvoz.ru/2997969028483xs7.pdfIn PDF document text
    • https://vivusujode.weebly.com/uploads/1/3/2/6/132682813/karugu.pdfIn PDF document text
    • http://nubolutlion.xyz/92594543005gfoqv.pdfIn PDF document text
    • https://sojagifuwolu.weebly.com/uploads/1/3/4/6/134689160/ralukonolemafif.pdfIn PDF document text
    • https://gininigexaviw.weebly.com/uploads/1/3/5/3/135350692/widovaxusetutu.pdfIn PDF document text
    • https://dorakipep.weebly.com/uploads/1/3/4/7/134747047/nudafixuweforibez.pdfIn PDF document text
    • https://cdn.sqhk.co/sepovili/gf0cgcF/67496395520.pdfIn PDF document text
    • http://seplafond.xyz/sowuwelawibejekikirva09.pdfIn PDF document text
    • https://cdn.sqhk.co/zupivikeg/jfCMFhg/top_100_station_frequenz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://buvumitibeve.rf.gd/meesaya_murukku_movie.pdfIn PDF document text
    • http://rapuzezu.epizy.com/golf_is_not_a_game_of_perfect_book_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a80c2d14-ff7e-49e3-8876-81e7d29b450c/45580006032.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb883470-c990-472e-85ff-ad724c84143a/53542116092.pdfIn PDF document text
    • http://vagakidid.epizy.com/rudaginabixoverikaro.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e73d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE73D 5188 bytes
SHA-256: 7bf95746e8f816ba25b6425d92d90ae4734e4fe5496e70b4903375fe0e28a9a3
font_01_sfnt_off0000f8c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C6 11008 bytes
SHA-256: 0b76b79316427f246a233a1fbb22d61a0b8b4a86fdfc121aee564e5769aa41ee