Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c97a8c8bc5b7220…

MALICIOUS

PDF

97.3 KB Created: 2021-05-14 01:52:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: ee34a52354f23d307a6b822f8ef45993 SHA-1: c5ce88c0c6194c07068675f337df62b02d7fde16 SHA-256: 4c97a8c8bc5b7220b2778b66a68b35ed29c496b91f59a16153275f9c894d5019
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged as malicious by multiple heuristics, including a critical finding for linking to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to dreams about cockroaches, which is a common lure in phishing scams. The numerous embedded URLs pointing to disposable domains strongly suggest an attempt to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • 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://yafferge.ru/strik?utm_term=que+significa+so%25C3%25B1ar+con+cucarachas+en+la+pared In PDF document text
    • https://jadegivi.weebly.com/uploads/1/3/4/8/134851053/85dfb9cf178d.pdfIn PDF document text
    • http://popubim.iblogger.org/6165081446.pdfIn PDF document text
    • https://vuvugero.weebly.com/uploads/1/3/2/7/132710729/worus_kijobebuzulun.pdfIn PDF document text
    • http://zovofuti.mygamesonline.org/puxidosorupawaxoribubozir.pdfIn PDF document text
    • https://xefakebeka.weebly.com/uploads/1/3/5/9/135993821/wikodituwed.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/golepe/columbus_ga_police_department_reports.pdfIn PDF document text
    • http://bedowapuwusagin.epizy.com/75170323029.pdfIn PDF document text
    • http://dipilijokofalav.rf.gd/31401461199.pdfIn PDF document text
    • http://pibumox.rf.gd/que_hace_un_ingeniero_mecanico_industrial.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c4e6b23-a607-4a41-b5b9-faf57bcdafcd/misusodonixabixuxojogix.pdfIn PDF document text
    • https://s3.amazonaws.com/tapexiw/acknowledgement_format_dissertation.pdfIn PDF document text
    • https://s3.amazonaws.com/takateg/84083316329.pdfIn PDF document text
    • http://lijivuzase.rf.gd/analysing_and_presenting_qualitative_data.pdfIn PDF document text
    • http://guriseb.myartsonline.com/43904365102.pdfIn PDF document text
    • http://pupagerirawax.myartsonline.com/goneberukukure.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7615d734-48d7-4cbf-9935-f54c721e7ef5/99561887441.pdfIn PDF document text
    • http://lofetumavigasi.epizy.com/botanical_names_of_fruits_list.pdfIn PDF document text
    • http://bajupigirosinaf.atwebpages.com/48957208525.pdfIn PDF document text
    • http://tevizowubutek.rf.gd/jomizipugidinexe.pdfIn PDF document text
    • http://wemosoxa.rf.gd/pilak.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_off00013dd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DD7 5688 bytes
SHA-256: 66fef44cf5166e53da18704a906db92fee6001dc477ff87cec3a2f717932b9c1
font_01_sfnt_off000150ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150ED 11256 bytes
SHA-256: 3b13bba05c1f99a123f177709363b2c60b2020fc118f075b0e98d0422e034a70

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