Malicious PDF — malware analysis report

Static analysis result for SHA-256 21cb240388771b7d…

MALICIOUS

PDF

101.3 KB Created: 2021-03-18 02:15:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 7db6319f69f7855ea35c38a9cd4dd0db SHA-1: 206ab6ec092ede063750493ec7d210115edbb808 SHA-256: 21cb240388771b7d80944d855b570238b344278fd74fd52ae81aace5346f2aae
126 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, with a primary focus on `https://resalured.ru/award?keyword=types+de+brancardage+pdf` and `http://vewisezozebo.22web.org/widojonixij.pdf`. The heuristic `PDF_SEO_DISPOSABLE_LINK_FARM` indicates a pattern of using many distinct, often disposable, hosting domains to obscure the true malicious intent. Although no scripts were explicitly extracted, the presence of embedded URLs and the overall detection profile strongly suggest a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

Heuristics 5

  • 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 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://resalured.ru/award?keyword=types+de+brancardage+pdf PDF link annotation
    • http://vewisezozebo.22web.org/widojonixij.pdfIn PDF document text
    • https://cdn.sqhk.co/delojiwuguj/i0jfZhi/spiral_perm_rods_for_sale.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366040/normal_5fe81c8ba8414.pdfIn PDF document text
    • https://cdn.sqhk.co/bitajububida/diVibhd/sifukezejidawasapizu.pdfIn PDF document text
    • https://cdn.sqhk.co/lolumebitana/idXjjTW/bonebot.pdfIn PDF document text
    • https://cdn.sqhk.co/pirasemofoge/jdgija9/45462193945.pdfIn PDF document text
    • https://semuzotefol.weebly.com/uploads/1/3/1/4/131437619/c3eb0302f.pdfIn PDF document text
    • https://xarefiliji.weebly.com/uploads/1/3/4/7/134735925/bifutusirivonix_mefipivir.pdfIn PDF document text
    • http://mewebewenuzotez.iblogger.org/874013183.pdfIn PDF document text
    • https://cdn.sqhk.co/dilipokoje/3jfD3ih/sunday_school_lesson_for_preschoolers_on_friendship.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408588/normal_5ff48ae00a74c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409818/normal_6003b9dcedfcf.pdfIn PDF document text
    • https://bajigexok.weebly.com/uploads/1/3/4/1/134131467/d63224.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417645/normal_6032e76acac44.pdfIn PDF document text
    • http://pasozabijegigus.iblogger.org/nevonuwobisikajefo.pdfIn PDF document text
    • https://filukekab.weebly.com/uploads/1/3/4/4/134478490/nebikes.pdfIn PDF document text
    • https://tarimewisu.weebly.com/uploads/1/3/0/7/130739021/1698741.pdfIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/setikizo/sample_enquiry_report_format.pdfIn PDF document text
    • http://notalopelovawu.epizy.com/biblical_hebrew_alphabet_chart.pdfIn PDF document text
    • https://s3.amazonaws.com/jadudusujuje/cheerleader_uniform_costume.pdfIn PDF document text
    • http://xadifoduboboriv.rf.gd/vokodigubuzameko.pdfIn PDF document text
    • http://binasizula.rf.gd/dont_think_of_an_elephant_quotes.pdfIn PDF document text
    • http://zesaxisakonona.epizy.com/android_one_ui_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/gumegulaxi/bali_tourism_map.pdfIn PDF document text
    • https://s3.amazonaws.com/wajibile/beats_solo_pro_wireless_nc_headphones_-_black.pdfIn PDF document text
    • http://sakigekoxigukil.epizy.com/bethesda_launcher_64_bit.pdfIn PDF document text
    • https://s3.amazonaws.com/jemisajoda/google_chrome_browser_themes_free.pdfIn PDF document text
    • http://rebipilu.epizy.com/examples_of_directional_and_nondirectional_hypothesis.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00012ca2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12CA2 21812 bytes
SHA-256: 78d31255e9a142caa399157eeac0209d8170be44f87d30d237c5c2210ae3756e
font_00_sfnt_off000119ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119EE 5484 bytes
SHA-256: c7912bdd168c4a116a7ee4e8341ee8151b1c4f5c3d87b71d2f1e0cac95ed36ec
font_02_sfnt_off00015a7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A7B 13624 bytes
SHA-256: 73e879d00614f96a1cd730bc797ec3b687991721de3fbf4c481146b0be29c8c5

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