Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f99c2677cf96849…

MALICIOUS

PDF

91.1 KB Created: 2021-02-23 09:49:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: b54f0118cf84075e148b8056e87353f6 SHA-1: 7749aba72ecf84fde46f8ac51bca805bedf708ee SHA-256: 2f99c2677cf96849b349f7c18fceb4d06b4a79e9ac51ead72970a976c06b2338
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were extracted, the PDF structure itself is used to facilitate the attack by redirecting users to potentially malicious or SEO-spam content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://bologen.ru/strik?utm_term=math+destroyer+review PDF link annotation
    • http://sale20.site/mackie_cfx12_mk2hapih.pdfIn PDF document text
    • http://wusejopajaxus.22web.org/zuzunuzilowizi.pdfIn PDF document text
    • https://fuwupizur.weebly.com/uploads/1/3/5/3/135390256/e485c5edd2967b.pdfIn PDF document text
    • https://noberewesuxo.weebly.com/uploads/1/3/1/3/131379636/pupepikafubobevuzipu.pdfIn PDF document text
    • https://peziwotikiju.weebly.com/uploads/1/3/4/6/134602895/tukatutokifa-kiteg-tunivirig-minenuxa.pdfIn PDF document text
    • https://segoponozumi.weebly.com/uploads/1/3/4/0/134000249/132375.pdfIn PDF document text
    • https://jegumozapibalan.weebly.com/uploads/1/3/4/0/134013344/1527809.pdfIn PDF document text
    • http://rerubin.space/drug_handbook_2020_freelnpza.pdfIn PDF document text
    • https://gipofomodofomew.weebly.com/uploads/1/3/2/3/132303323/dagipiwelipasutek.pdfIn PDF document text
    • http://kigowamukidiba.iblogger.org/planarian_regeneration_lab_report_abstract.pdfIn PDF document text
    • https://cdn.sqhk.co/jakovenuz/KjgFgiO/38278404523.pdfIn PDF document text
    • https://pitefomut.weebly.com/uploads/1/3/2/6/132682610/kogez.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://roxubimolileko.epizy.com/metallica_font_style.pdfIn PDF document text
    • http://vaduxovogemuke.epizy.com/kijifutujumimolufe.pdfIn PDF document text
    • http://ribitotuv.epizy.com/number_line_activities.pdfIn PDF document text
    • http://vubetogezomu.rf.gd/fitted_face_mask_pattern_with_filter_pocket_uk.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_off00012946.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12946 5140 bytes
SHA-256: daeb8f2b5198ea039188a324e30e3e60174cffcf384909704832994e7d2c02b6
font_01_sfnt_off00013ada.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ADA 11052 bytes
SHA-256: 1a68e9d08d05505bdacfd37239680487e6b47f9530bc0bf20bee3150f0986199

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