Malicious PDF — malware analysis report

Static analysis result for SHA-256 61c2170206fc5eae…

MALICIOUS

PDF

67.9 KB Created: 2021-02-23 22:24:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 6c6690ff4eadd4542e547e246dee7aae SHA-1: 6e7504ee3465f80045d37375591d9d89b4ef79db SHA-256: 61c2170206fc5eaebcebe6655a243cbe315529db6f054f7c8449966f70242376
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many hosted on disposable domains like weebly.com, suggesting a link farm or SEO spam operation. The document body, though truncated and partially obfuscated, references 'Sopa de letras para imprimir pdf animales' (word search to print animals pdf), which is likely a lure to disguise the malicious intent. The presence of multiple PDF link farm heuristics and a high ML classifier score strongly indicate malicious activity, likely aimed at driving traffic to malicious sites or potentially distributing further malware.

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://baarspo.ru/123?utm_term=sopa+de+letras+para+imprimir+pdf+animales PDF link annotation
    • https://donefuvo.weebly.com/uploads/1/3/1/1/131164418/xatari.pdfIn PDF document text
    • https://jawasolasazilem.weebly.com/uploads/1/3/1/3/131379174/jatazibimokar.pdfIn PDF document text
    • https://rexawalifutox.weebly.com/uploads/1/3/4/4/134458468/rejur_kedetupilowap.pdfIn PDF document text
    • https://bujubemido.weebly.com/uploads/1/3/0/7/130776032/2c4e4e60.pdfIn PDF document text
    • https://rugeponejap.weebly.com/uploads/1/3/4/4/134487210/4991355.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484399/normal_5fcf46974dabb.pdfIn PDF document text
    • https://sapuzexa.weebly.com/uploads/1/3/5/3/135348006/82aa2.pdfIn PDF document text
    • https://fubareno.weebly.com/uploads/1/3/1/4/131482864/9090105.pdfIn PDF document text
    • http://shopsupergood.site/which_circumpolar_constellation_is_visible_in_the_northern_hemispherez3x9e.pdfIn PDF document text
    • https://gawinesiti.weebly.com/uploads/1/3/5/3/135383431/niruwir.pdfIn PDF document text
    • https://jekewuvewaw.weebly.com/uploads/1/3/1/0/131070420/veroti-boxewukupu-xawijog.pdfIn PDF document text
    • https://natedutaz.weebly.com/uploads/1/3/4/8/134850225/965889.pdfIn PDF document text
    • https://zaxonuwikujad.weebly.com/uploads/1/3/0/8/130874627/jutexisafi-jitaxomu-kopalijege.pdfIn PDF document text
    • https://falugasotemo.weebly.com/uploads/1/3/1/4/131410545/zexulonez-pezekesew-kidolupewefipe.pdfIn PDF document text
    • http://usacreditmonitoring.info/cbse_grade_9_english_textbookcubmc.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/widetunipet/89032233532.pdfIn PDF document text
    • https://s3.amazonaws.com/tapelu/flannel_sheets_king_bed.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_off0000cb22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB22 5292 bytes
SHA-256: b744940bc860980444e24987c5f4b8f69f39e4dcf30b5e6be147ff8819018e5f
font_01_sfnt_off0000dd09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD09 10740 bytes
SHA-256: 58922cfe4995f1e5e2ea2075ad4cdb1537e17bbceedb6fcf01ee84ca00789530

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